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Il gioco \Life": la matematica della vita di Alessandro Musesti Universit a Cattolica del Sacro Cuore, Brescia 30 gennaio 2018 Alessandro Musesti - Univ. Cattolica
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Page 1: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Il gioco “Life”: la matematica della vita

di Alessandro Musesti

Universita Cattolica del Sacro Cuore, Brescia

30 gennaio 2018

Alessandro Musesti - Univ. Cattolica

Page 2: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

CORSO DI LAUREA TRIENNALE IN

MATEMATICA con curricula in Matematica, Fisica e Informatica (CLASSE L35)

Il corso di laurea triennale realizza tre distinti percorsi formativi:

• un curriculum in Matematica• un curriculum in Fisica• un curriculum in Informatica, di nuova istituzione

In particolare, i curricula in Fisica e in Informatica assicurano una formazione equivalente rispettivamente a una laurea triennale in Fisica e a una laurea triennale in Scienze dell’informazione.

Tutti i curricula forniscono approfondite e moderne conoscenze di base nell’area della matematica, focalizzando nel contempo la propria attenzione nei rispettivi percorsi sui distinti ambiti disciplinari della matematica, della fisica e dell’informatica..

Page 3: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Skeletal muscle tissue

Page 4: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

The passive model

Ehret, Bol, Itskov, JMPS, 59 (2011)

Wpas(C) =µ

4

�1

α(eα(Ip−1) − 1) + Kp − 1

Ip = w0tr C

3+ (1 − w0) tr CM

Kp = w0tr C−1

3+ (1 − w0) tr C−1M

C = FTF, det C = 1, M = m ⊗ m

1.0 1.1 1.2 1.3 1.4

stretch λ

0

10

20

30

40

50

60

[kPa]

Hawkins and Bey

Passive stress

µ = 0.1599 kPa

α = 19.35

w0 = 0.7335

The energy is polyconvex and coercive.

The parameters µ,α, w0 can be fitted with experimental data on therelation between stress and strain in passive skeletal muscle

Page 5: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Effects of the loss of mass

0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4

λ

0

20

40

60

80

100Ptot[kPa]

t =30 years

t =40 years

t =60 years

t =80 years

Page 6: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Il gioco ‘Life’ di Conway

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Life fu inventato da Conway alla fine degli annisessanta del secolo scorso.

John Horton Conway, nato nel 1937, e unmatematico inglese, specializzato in teoria deigruppi (che e una parte dell’Algebra). E unostraordinario inventore di giochi e rompicapi, che disolito studia e risolve piuttosto velocemente.Quando ha inventato Life, pero, non credevacertamente che il gioco potesse contenere quelmondo che poi vedremo.

Alessandro Musesti - Univ. Cattolica

Page 7: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Il gioco ‘Life’ di Conway

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Life fu inventato da Conway alla fine degli annisessanta del secolo scorso.

John Horton Conway, nato nel 1937, e unmatematico inglese, specializzato in teoria deigruppi (che e una parte dell’Algebra). E unostraordinario inventore di giochi e rompicapi, che disolito studia e risolve piuttosto velocemente.

Quando ha inventato Life, pero, non credevacertamente che il gioco potesse contenere quelmondo che poi vedremo.

Alessandro Musesti - Univ. Cattolica

Page 8: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Il gioco ‘Life’ di Conway

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Life fu inventato da Conway alla fine degli annisessanta del secolo scorso.

John Horton Conway, nato nel 1937, e unmatematico inglese, specializzato in teoria deigruppi (che e una parte dell’Algebra). E unostraordinario inventore di giochi e rompicapi, che disolito studia e risolve piuttosto velocemente.Quando ha inventato Life, pero, non credevacertamente che il gioco potesse contenere quelmondo che poi vedremo.

Alessandro Musesti - Univ. Cattolica

Page 9: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Le regole del gioco

Il “mondo” e una griglia bidimensionale infinita e le “cellule” possonooccupare le caselle di questa griglia.

La vita nella casella rossa centrale dipende dalle otto caselle vicine. Laregola di Life e denotata da B3/S23.

Alessandro Musesti - Univ. Cattolica

Page 10: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Le regole del gioco

Regola 1: NASCERESe una casella vuota e vicina esattamente a tre cellule vive, in essanascera una cellula (le cellule si riproducono)

Alessandro Musesti - Univ. Cattolica

Page 11: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Le regole del gioco

Regola 1: NASCERESe una casella vuota e vicina esattamente a tre cellule vive, in essanascera una cellula (le cellule si riproducono)

Alessandro Musesti - Univ. Cattolica

Page 12: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Le regole del gioco

Regola 2: VIVERESe una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (lecellule si aiutano a vicenda)

Alessandro Musesti - Univ. Cattolica

Page 13: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Le regole del gioco

Regola 3: MORIRESe una cellula e vicina a 4 o piu cellule vive, o a meno di 2 cellule, essamorira (per sovraffollamento o isolamento)

Alessandro Musesti - Univ. Cattolica

Page 14: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Le regole del gioco

Regola 3: MORIRESe una cellula e vicina a 4 o piu cellule vive, o a meno di 2 cellule, essamorira (per sovraffollamento o isolamento)

Alessandro Musesti - Univ. Cattolica

Page 15: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Esempi

La cellula muore

La cellula sopravvive

Alessandro Musesti - Univ. Cattolica

Page 16: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Esempi

La cellula muore

La cellula sopravvive

Alessandro Musesti - Univ. Cattolica

Page 17: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Esempi

La cellula nasce

La cellula sopravvive

Alessandro Musesti - Univ. Cattolica

Page 18: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Esempi

La cellula nasce

La cellula sopravvive

Alessandro Musesti - Univ. Cattolica

Page 19: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Esempi

La cellula sopravvive

Alessandro Musesti - Univ. Cattolica

Page 20: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Life su Scientific American

Ma Life e difentato famoso a partire dall’ottobre del 1970, quando MartinGardner lo descrisse nella sua popolare rubrica “Mathematical Games”della rivista “Scientific American”, ponendo anche qualche quesito nonancora risolto.

Il gioco ebbe tale successo che Martin Gardner ne scrisse in modo piuapprofondito nel febbraio del 1971.

Gardner scrive:“My 1970 column on Conway’s Life met with such an instant enthusiasticresponse among computer hackers around the world that their mania forexploring Life forms was estimated to have cost the nation millions ofdollars in illicit computer time.”

Alessandro Musesti - Univ. Cattolica

Page 21: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Life su Scientific American

Ma Life e difentato famoso a partire dall’ottobre del 1970, quando MartinGardner lo descrisse nella sua popolare rubrica “Mathematical Games”della rivista “Scientific American”, ponendo anche qualche quesito nonancora risolto.Il gioco ebbe tale successo che Martin Gardner ne scrisse in modo piuapprofondito nel febbraio del 1971.

Gardner scrive:“My 1970 column on Conway’s Life met with such an instant enthusiasticresponse among computer hackers around the world that their mania forexploring Life forms was estimated to have cost the nation millions ofdollars in illicit computer time.”

Alessandro Musesti - Univ. Cattolica

Page 22: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Life su Scientific American

Ma Life e difentato famoso a partire dall’ottobre del 1970, quando MartinGardner lo descrisse nella sua popolare rubrica “Mathematical Games”della rivista “Scientific American”, ponendo anche qualche quesito nonancora risolto.Il gioco ebbe tale successo che Martin Gardner ne scrisse in modo piuapprofondito nel febbraio del 1971.

Gardner scrive:“My 1970 column on Conway’s Life met with such an instant enthusiasticresponse among computer hackers around the world that their mania forexploring Life forms was estimated to have cost the nation millions ofdollars in illicit computer time.”

Alessandro Musesti - Univ. Cattolica

Page 23: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Un po’ di classificazione

All’inizio, John Conway e molti altri hanno cercato di classificare i possibiliesiti delle configurazioni iniziali di Life.Tra le piu semplici “forme di vita” troviamo le still life (nature morte):sono configurazioni stabili, che non cambiano nel tempo. Ce ne sono duecon 4 celle, una con 5 celle, cinque con 6 celle e quattro con 7 celle.Vengono dati nomi strani a queste semplici “forme di vita”: blocco, vascada bagno, alveare, barca, nave. . .

Alessandro Musesti - Univ. Cattolica

Page 24: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Still life

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0

Alessandro Musesti - Univ. Cattolica

Page 25: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Oscillatori

Gli oscillatori sono configurazioni che si ripetono dopo un certo numero dipassi. Il piu semplice e il lampeggiante, di periodo 2, che e tra le forme divita piu comuni.

Alessandro Musesti - Univ. Cattolica

Page 26: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Oscillatori

Gli oscillatori sono configurazioni che si ripetono dopo un certo numero dipassi. Il piu semplice e il lampeggiante, di periodo 2, che e tra le forme divita piu comuni.

Alessandro Musesti - Univ. Cattolica

Page 27: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Oscillatori

Gli oscillatori sono configurazioni che si ripetono dopo un certo numero dipassi. Il piu semplice e il lampeggiante, di periodo 2, che e tra le forme divita piu comuni.

Alessandro Musesti - Univ. Cattolica

Page 28: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Oscillatori

Gli oscillatori sono configurazioni che si ripetono dopo un certo numero dipassi. Il piu semplice e il lampeggiante, di periodo 2, che e tra le forme divita piu comuni.

Alessandro Musesti - Univ. Cattolica

Page 29: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Oscillatori

Gli oscillatori sono configurazioni che si ripetono dopo un certo numero dipassi. Il piu semplice e il lampeggiante, di periodo 2, che e tra le forme divita piu comuni.

Alessandro Musesti - Univ. Cattolica

Page 30: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Oscillatori

Gli altri oscillatori di periodo 2 sono il rospo e il bacon.

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Alessandro Musesti - Univ. Cattolica

Page 31: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Oscillatori

Gli altri oscillatori di periodo 2 sono il rospo e il bacon.

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Alessandro Musesti - Univ. Cattolica

Page 32: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

La galassia

La galassia e un oscillatore molto bello, di periodo 8.

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Inizio Salta

Alessandro Musesti - Univ. Cattolica

Page 33: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

La galassia

La galassia e un oscillatore molto bello, di periodo 8.

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Inizio Salta

Alessandro Musesti - Univ. Cattolica

Page 34: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

La galassia

La galassia e un oscillatore molto bello, di periodo 8.

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Inizio Salta

Alessandro Musesti - Univ. Cattolica

Page 35: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

La galassia

La galassia e un oscillatore molto bello, di periodo 8.

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Inizio Salta

Alessandro Musesti - Univ. Cattolica

Page 36: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

La galassia

La galassia e un oscillatore molto bello, di periodo 8.

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Inizio Salta

Alessandro Musesti - Univ. Cattolica

Page 37: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

La galassia

La galassia e un oscillatore molto bello, di periodo 8.

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Inizio Salta

Alessandro Musesti - Univ. Cattolica

Page 38: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

La galassia

La galassia e un oscillatore molto bello, di periodo 8.

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Inizio Salta

Alessandro Musesti - Univ. Cattolica

Page 39: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

La galassia

La galassia e un oscillatore molto bello, di periodo 8.

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Inizio Salta

Alessandro Musesti - Univ. Cattolica

Page 40: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

La galassia

La galassia e un oscillatore molto bello, di periodo 8.

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Inizio Salta

Alessandro Musesti - Univ. Cattolica

Page 41: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Alcune semplici configurazioni: fila da 4

Salta animazione

Alessandro Musesti - Univ. Cattolica

Page 42: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

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Page 46: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Fila da 5

Torna indietro Salta animazione

Alessandro Musesti - Univ. Cattolica

Page 47: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

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Fila da 6

Torna indietro Salta animazione

Alessandro Musesti - Univ. Cattolica

Page 57: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

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Fila da 7

Torna indietro Salta animazione

Alessandro Musesti - Univ. Cattolica

Page 71: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

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Page 84: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

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Page 85: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

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Page 86: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Fine animazione fila da 7

Torna indietro

Alessandro Musesti - Univ. Cattolica

Page 87: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

La classificazione e complessa

Riassumiamo che cosa succede partendo partendo dalle configurazionimolto semplici fatte da una riga di n celle vive:

n = 3 lampeggiante n = 4 alveare n = 5 quattro lampeggianti

n = 6 scompare n = 7 quattro alveari n = 8 blocchi e alveari

n = 9 lampeggianti n = 10 pentadecatlon n = 11 due lampeggianti

n = 12 due alveari n = 13 due lampeggianti n = 14 scompare

n = 15 scompare n = 16 lampeggianti n = 17 quattro blocchi

n = 18 scompare n = 19 scompare n = 20 due blocchi

Life e un sistema non lineare!(non vale il principio di sovrapposizione degli effetti. . . )

Esempio: H e Π.

Alessandro Musesti - Univ. Cattolica

Page 88: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

La classificazione e complessa

Riassumiamo che cosa succede partendo partendo dalle configurazionimolto semplici fatte da una riga di n celle vive:

n = 3 lampeggiante n = 4 alveare n = 5 quattro lampeggianti

n = 6 scompare n = 7 quattro alveari n = 8 blocchi e alveari

n = 9 lampeggianti n = 10 pentadecatlon n = 11 due lampeggianti

n = 12 due alveari n = 13 due lampeggianti n = 14 scompare

n = 15 scompare n = 16 lampeggianti n = 17 quattro blocchi

n = 18 scompare n = 19 scompare n = 20 due blocchi

Life e un sistema non lineare!(non vale il principio di sovrapposizione degli effetti. . . )

Esempio: H e Π.

Alessandro Musesti - Univ. Cattolica

Page 89: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

La classificazione e complessa

Riassumiamo che cosa succede partendo partendo dalle configurazionimolto semplici fatte da una riga di n celle vive:

n = 3 lampeggiante n = 4 alveare n = 5 quattro lampeggianti

n = 6 scompare n = 7 quattro alveari n = 8 blocchi e alveari

n = 9 lampeggianti n = 10 pentadecatlon n = 11 due lampeggianti

n = 12 due alveari n = 13 due lampeggianti n = 14 scompare

n = 15 scompare n = 16 lampeggianti n = 17 quattro blocchi

n = 18 scompare n = 19 scompare n = 20 due blocchi

Life e un sistema non lineare!(non vale il principio di sovrapposizione degli effetti. . . )

Esempio: H e Π.

Alessandro Musesti - Univ. Cattolica

Page 90: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Advertisement

http://golly.sourceforge.net

Per Linux, Windows, Mac, iPad, Android

Alessandro Musesti - Univ. Cattolica

Page 91: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Il pentamino R

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Il pentamino R si stabilizza dopo 1103 generazioni, raggiungendo unapopolazione di 116 cellule: 8 blocchi, 6 glider, 4 alveari, 4 lampeggianti,una barca, una pagnotta, una nave.

Alessandro Musesti - Univ. Cattolica

Page 92: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

L’aliante e altre astronavi

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In Life esistono oggetti che traslano indefinitamente! Tra questi il piufamoso e il glider (aliante), scoperto da Conway, e tre oggetti chiamatiastronave leggera, astronave media, astronave pesante.

astronavi spaceship-types

Alessandro Musesti - Univ. Cattolica

Page 93: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Altri esempi

gosper

proliferazione

Numeri primi

Glider synthesis

Nel 1982 Conway dimostro che Life e una macchina di Turing universale,ovvero ha le stesse capacita di un qualsiasi computer!

Alessandro Musesti - Univ. Cattolica

Page 94: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Altri esempi

gosper

proliferazione

Numeri primi

Glider synthesis

Nel 1982 Conway dimostro che Life e una macchina di Turing universale,ovvero ha le stesse capacita di un qualsiasi computer!

Alessandro Musesti - Univ. Cattolica

Page 95: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Velocita e direzione delle astronavi

La velocita massima consentita in Life e di una casella alla volta, e vienedenotata con c . Si dimostra che non possono esistere oggetti che simuovono con una velocita superiore a c/2.Le tre astronavi viste prima hanno proprio velocita c/2. Il glider invece havelocita c/4 (si conta solo lo spostamento orizzontale o verticale).

Fino al 2010 tutte le astronavi conosciute si muovevano ortogonalmente(come l’astronave leggera) o a 45 gradi (come il glider). Solo nel 2010Andrew Wade ha scoperto (o inventato?) Gemini, formata da 846278cellule, che si sposta di 5120 celle in verticale e 1024 in orizzontale ogni33699586 generazioni, quindi si muove con una pendenza di 5.

A luglio del 2014 e stata costruita una nuova astronave, la Parallel HBK,molto piu semplice di Gemini (132945 cellule), che si muove con pendenza2 in 245912 generazioni, grazie al lavoro di Chris Cain, Ivan Fomichev,Dave Greene e Adam Goucher, che hanno collaborato lavorando su unblog.

parallel HBK: (6,3)c/245912

Alessandro Musesti - Univ. Cattolica

Page 96: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Velocita e direzione delle astronavi

La velocita massima consentita in Life e di una casella alla volta, e vienedenotata con c . Si dimostra che non possono esistere oggetti che simuovono con una velocita superiore a c/2.Le tre astronavi viste prima hanno proprio velocita c/2. Il glider invece havelocita c/4 (si conta solo lo spostamento orizzontale o verticale).

Fino al 2010 tutte le astronavi conosciute si muovevano ortogonalmente(come l’astronave leggera) o a 45 gradi (come il glider). Solo nel 2010Andrew Wade ha scoperto (o inventato?) Gemini, formata da 846278cellule, che si sposta di 5120 celle in verticale e 1024 in orizzontale ogni33699586 generazioni, quindi si muove con una pendenza di 5.

A luglio del 2014 e stata costruita una nuova astronave, la Parallel HBK,molto piu semplice di Gemini (132945 cellule), che si muove con pendenza2 in 245912 generazioni, grazie al lavoro di Chris Cain, Ivan Fomichev,Dave Greene e Adam Goucher, che hanno collaborato lavorando su unblog.

parallel HBK: (6,3)c/245912

Alessandro Musesti - Univ. Cattolica

Page 97: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Velocita e direzione delle astronavi

La velocita massima consentita in Life e di una casella alla volta, e vienedenotata con c . Si dimostra che non possono esistere oggetti che simuovono con una velocita superiore a c/2.Le tre astronavi viste prima hanno proprio velocita c/2. Il glider invece havelocita c/4 (si conta solo lo spostamento orizzontale o verticale).

Fino al 2010 tutte le astronavi conosciute si muovevano ortogonalmente(come l’astronave leggera) o a 45 gradi (come il glider). Solo nel 2010Andrew Wade ha scoperto (o inventato?) Gemini, formata da 846278cellule, che si sposta di 5120 celle in verticale e 1024 in orizzontale ogni33699586 generazioni, quindi si muove con una pendenza di 5.

A luglio del 2014 e stata costruita una nuova astronave, la Parallel HBK,molto piu semplice di Gemini (132945 cellule), che si muove con pendenza2 in 245912 generazioni, grazie al lavoro di Chris Cain, Ivan Fomichev,Dave Greene e Adam Goucher, che hanno collaborato lavorando su unblog.

parallel HBK: (6,3)c/245912

Alessandro Musesti - Univ. Cattolica

Page 98: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Velocita e direzione delle astronavi – 2

Il 28 dicembre 2014 Brett Berger ha costruito Waterbear, un’astronave chepercorre 23 celle in verticale e 5 in orizzontale ogni 79 generazioni. Puressendo formata da 197896 cellule, che sono piu di quelle della ParallelKBH, ha una velocita estremamente piu alta:

waterbear: (23,5)c/79

Alessandro Musesti - Univ. Cattolica

Page 99: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Life simula se stesso

Outer Totalistic Cellular Automata Meta Pixel (OTCAMP) e unaconfigurazione di Life che occupa un’area di 2048x2048 celle e ha unaperiodicita di 35328 generazioni.

Ogni cellula “piena” e fatta da piu di 60000 cellule vive, mentre le cellule“vuote” da circa 23000.

Con queste “celle” si puo emulare Life dentro se stesso. E si possonoanche emulare altre regole dentro Life. . .

metapixel meta-blinker meta-tennis

replicator-metapixel contatore

Alessandro Musesti - Univ. Cattolica

Page 100: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Life simula se stesso

Outer Totalistic Cellular Automata Meta Pixel (OTCAMP) e unaconfigurazione di Life che occupa un’area di 2048x2048 celle e ha unaperiodicita di 35328 generazioni.

Ogni cellula “piena” e fatta da piu di 60000 cellule vive, mentre le cellule“vuote” da circa 23000.

Con queste “celle” si puo emulare Life dentro se stesso. E si possonoanche emulare altre regole dentro Life. . .

metapixel meta-blinker meta-tennis

replicator-metapixel contatore

Alessandro Musesti - Univ. Cattolica

Page 101: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Life simula se stesso

Outer Totalistic Cellular Automata Meta Pixel (OTCAMP) e unaconfigurazione di Life che occupa un’area di 2048x2048 celle e ha unaperiodicita di 35328 generazioni.

Ogni cellula “piena” e fatta da piu di 60000 cellule vive, mentre le cellule“vuote” da circa 23000.

Con queste “celle” si puo emulare Life dentro se stesso. E si possonoanche emulare altre regole dentro Life. . .

metapixel meta-blinker meta-tennis

replicator-metapixel contatore

Alessandro Musesti - Univ. Cattolica

Page 102: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Life simula se stesso

Outer Totalistic Cellular Automata Meta Pixel (OTCAMP) e unaconfigurazione di Life che occupa un’area di 2048x2048 celle e ha unaperiodicita di 35328 generazioni.

Ogni cellula “piena” e fatta da piu di 60000 cellule vive, mentre le cellule“vuote” da circa 23000.

Con queste “celle” si puo emulare Life dentro se stesso. E si possonoanche emulare altre regole dentro Life. . .

metapixel meta-blinker meta-tennis

replicator-metapixel contatore

Alessandro Musesti - Univ. Cattolica

Page 103: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Formalizziamo il modello

Per definire un automa cellulareabbiamo bisogno di:

un ambiente in cui metterele cellule

un insieme di stati dellacellula

la definizione di intorno diuna cellula

una regola di evoluzione

Nel caso di Life abbiamo:

griglia quadrata infinitaZ× Zcellula viva s = 1cellula morta s = 0

l’intorno U(x) dato dalleotto caselle vicine (senza x)

la regola di Life e data da:

st+1(x) =

1 se pt(x) = 3

1 se pt(x) = 2 e st(x) = 1

0 altrimenti

dove pt(x) e il numero di cellule vive in U(x) al tempo t, cioe

pt(x) =∑

y∈U(x)

st(y)

Alessandro Musesti - Univ. Cattolica

Page 104: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Formalizziamo il modello

Per definire un automa cellulareabbiamo bisogno di:

un ambiente in cui metterele cellule

un insieme di stati dellacellula

la definizione di intorno diuna cellula

una regola di evoluzione

Nel caso di Life abbiamo:

griglia quadrata infinitaZ× Zcellula viva s = 1cellula morta s = 0

l’intorno U(x) dato dalleotto caselle vicine (senza x)

la regola di Life e data da:

st+1(x) =

1 se pt(x) = 3

1 se pt(x) = 2 e st(x) = 1

0 altrimenti

dove pt(x) e il numero di cellule vive in U(x) al tempo t, cioe

pt(x) =∑

y∈U(x)

st(y)

Alessandro Musesti - Univ. Cattolica

Page 105: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Formalizziamo il modello

Per definire un automa cellulareabbiamo bisogno di:

un ambiente in cui metterele cellule

un insieme di stati dellacellula

la definizione di intorno diuna cellula

una regola di evoluzione

Nel caso di Life abbiamo:

griglia quadrata infinitaZ× Zcellula viva s = 1cellula morta s = 0

l’intorno U(x) dato dalleotto caselle vicine (senza x)

la regola di Life e data da:

st+1(x) =

1 se pt(x) = 3

1 se pt(x) = 2 e st(x) = 1

0 altrimenti

dove pt(x) e il numero di cellule vive in U(x) al tempo t, cioe

pt(x) =∑

y∈U(x)

st(y)

Alessandro Musesti - Univ. Cattolica

Page 106: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Generalizzazioni

griglie diverse (triangolari, esagonali, toroidali, tridimensionali,Penrose, casuali. . . )

piu di due stati

altri intorni (Von Neumann)

regole probabilistiche

regole asincrone (gli stati cambiano uno alla volta)

Alessandro Musesti - Univ. Cattolica

Page 107: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Generalizzazioni

griglie diverse (triangolari, esagonali, toroidali, tridimensionali,Penrose, casuali. . . )

piu di due stati

altri intorni (Von Neumann)

regole probabilistiche

regole asincrone (gli stati cambiano uno alla volta)

Alessandro Musesti - Univ. Cattolica

Page 108: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Generalizzazioni

griglie diverse (triangolari, esagonali, toroidali, tridimensionali,Penrose, casuali. . . )

piu di due stati

altri intorni (Von Neumann)

regole probabilistiche

regole asincrone (gli stati cambiano uno alla volta)

Alessandro Musesti - Univ. Cattolica

Page 109: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Generalizzazioni

griglie diverse (triangolari, esagonali, toroidali, tridimensionali,Penrose, casuali. . . )

piu di due stati

altri intorni (Von Neumann)

regole probabilistiche

regole asincrone (gli stati cambiano uno alla volta)

Alessandro Musesti - Univ. Cattolica

Page 110: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Generalizzazioni

griglie diverse (triangolari, esagonali, toroidali, tridimensionali,Penrose, casuali. . . )

piu di due stati

altri intorni (Von Neumann)

regole probabilistiche

regole asincrone (gli stati cambiano uno alla volta)

Alessandro Musesti - Univ. Cattolica

Page 111: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

HighLife

Un’altra regola molto studiata e la B36/S23. Conway stesso afferma:It seems to me that B36/S23 is really the game I should have found, sinceit’s so rich in nice things.

L’interesse principale di questa regola e che ammette un sempliceriproduttore, cioe una forma che si riproduce identica a se stessa.

Salta animazione

Alessandro Musesti - Univ. Cattolica

Page 112: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

HighLife

Un’altra regola molto studiata e la B36/S23. Conway stesso afferma:It seems to me that B36/S23 is really the game I should have found, sinceit’s so rich in nice things.

L’interesse principale di questa regola e che ammette un sempliceriproduttore, cioe una forma che si riproduce identica a se stessa.

Salta animazione

Alessandro Musesti - Univ. Cattolica

Page 113: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

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Page 114: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

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Page 115: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

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Page 116: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

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Page 117: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

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Page 118: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

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Fine animazione riproduttore

Torna indietro

Alessandro Musesti - Univ. Cattolica

Page 127: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Replicator Life

Esiste anche una regola in cui ogni forma si autoreplica: B1357/S1357.

Ovviamente questa regola non da luogo a sviluppi interessanti, anche sepuo essere simpatica da vedere.

esempio

Alessandro Musesti - Univ. Cattolica

Page 128: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Riproduttore in Life

Poiche Life e una macchina di Turing universale, questo implica che anchein Life esiste un riproduttore. Una tale configurazione pero non era maistata trovata, fino al novembre del 2013, quando Dave Greene, basandosisulle idee dell’astronave Gemini, e riuscito a costruire i primi riproduttori diLife.

I piu veloci impiegano circa 88 milioni di passi per riprodursi. Nell’esempione vedremo uno che ne impiega 237 milioni, ma che e piu veloce in Golly.

riproduttore

Alessandro Musesti - Univ. Cattolica

Page 129: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Riproduttore in Life

Poiche Life e una macchina di Turing universale, questo implica che anchein Life esiste un riproduttore. Una tale configurazione pero non era maistata trovata, fino al novembre del 2013, quando Dave Greene, basandosisulle idee dell’astronave Gemini, e riuscito a costruire i primi riproduttori diLife.I piu veloci impiegano circa 88 milioni di passi per riprodursi. Nell’esempione vedremo uno che ne impiega 237 milioni, ma che e piu veloce in Golly.

riproduttore

Alessandro Musesti - Univ. Cattolica

Page 130: Life: la matematica della vitamusesti/divulg/Life.pdf · Se una cellula viva e vicina a 2 o 3 cellule vive, essa continua a vivere (le cellule si aiutano a vicenda) Alessandro Musesti

Per finire

gardner

Alessandro Musesti - Univ. Cattolica


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