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# Documents  91A40 | enregistrements trouvés : 9

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## The evolution of cooperation in an iterated survival game Wakeley, John | CIRM H

Post-edited

Research talks;Mathematics in Science and Technology;Probability and Statistics

A new type of a simple iterated game with natural biological motivation is introduced. Two individuals are chosen at random from a population. They must survive a certain number of steps. They start together, but if one of them dies the other one tries to survive on its own. The only payoff is to survive the game. We only allow two strategies: cooperators help the other individual, while defectors do not. There is no strategic complexity. There are no conditional strategies. Depending on the number of steps we recover various forms of stringent and relaxed cooperative dilemmas. We derive conditions for the evolution of cooperation.
Specifically, we describe an iterated game between two players, in which the payoff is to survive a number of steps. Expected payoffs are probabilities of survival. A key feature of the game is that individuals have to survive on their own if their partner dies. We consider individuals with simple, unconditional strategies. When both players are present, each step is a symmetric two-player game. As the number of iterations tends to infinity, all probabilities of survival decrease to zero. We obtain general, analytical results for n-step payoffs and use these to describe how the game changes as n increases. In order to predict changes in the frequency of a cooperative strategy over time, we embed the survival game in three different models of a large, well-mixed population. Two of these models are deterministic and one is stochastic. Offspring receive their parent’s type without modification and fitnesses are determined by the game. Increasing the number of iterations changes the prospects for cooperation. All models become neutral in the limit $(n \rightarrow \infty)$. Further, if pairs of cooperative individuals survive together with high probability, specifically higher than for any other pair and for either type when it is alone, then cooperation becomes favored if the number of iterations is large enough. This holds regardless of the structure of pairwise interactions in a single step. Even if the single-step interaction is a Prisoner’s Dilemma, the cooperative type becomes favored. Enhanced survival is crucial in these iterated evolutionary games: if players in pairs start the game with a fitness deficit relative to lone individuals, the prospects for cooperation can become even worse than in the case of a single-step game.
A new type of a simple iterated game with natural biological motivation is introduced. Two individuals are chosen at random from a population. They must survive a certain number of steps. They start together, but if one of them dies the other one tries to survive on its own. The only payoff is to survive the game. We only allow two strategies: cooperators help the other individual, while defectors do not. There is no strategic complexity. There ...

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## Evolutionary branching: trade-offs and magic traits Kisdi, Eva | CIRM H

Multi angle

Research talks;Mathematics in Science and Technology

Adaptive dynamics has shaped our understanding of evolution by demonstrating that, via the process of evolutionary branching, ecological interactions can promote diversification. The classical approach to study the adaptive dynamics of a system is to specify the ecological model including all trade-off functions and other functional relationships, and make predictions depending on the parameters of these functions. However, the choice of trade-offs and other functions is often the least well justified element of the model, and examples show that minor variations in these functions can lead to qualitative changes in the model predictions. In the first part of this talk, I shall revisit evolutionary branching and other evolutionary phenomena predicted by adaptive dynamics using an inverse approach: I investigate under which conditions a trade-off function exists that yields a given evolutionary outcome.
Evolutionary branching can amount to the birth of new species, but only if reproductive isolation evolves between the emerging branches. Recent studies show that mating is often assortative with respect to the very trait that is under ecological selection. Such "magic traits" can ensure reproductive isolation, yet they are by far not free tickets to speciation. In the second half of my talk, I discuss the consequences of sexual selection emerging from assortative mating, and show how a perfect female should search for mates.
Adaptive dynamics has shaped our understanding of evolution by demonstrating that, via the process of evolutionary branching, ecological interactions can promote diversification. The classical approach to study the adaptive dynamics of a system is to specify the ecological model including all trade-off functions and other functional relationships, and make predictions depending on the parameters of these functions. However, the choice of ...

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## Economie théorique Montbrial, Thierry de | Presses Universitaires De France 1971

Ouvrage

- xv; 206 p.

Systèmes-décisions. Section 3: mathématiques et statistiques pour la décision

Localisation : Ouvrage RdC (MONT)

microéconomie # macroéconomie # prise de décision # calcul économique # économie politique # mathématiques économiques

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## Non-cooperative equilibria of Fermi systems with long range interactions Bru, J.-B. ; de Siqueira Pedra, W. | American Mathematical Society 2012

Ouvrage

- xi; 155 p.
ISBN 978-0-8218-8976-3

Memoirs of the american mathematical society , 1052

Localisation : Collection 1er étage

équilibre thermodynamique # règle de phase # physique mathématique # intéraction à long terme # théorème de Choquet # approximation de Bogoliubov # système de spin quantique

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## Security and game theory:algorithms, deployed systems, lessons learned Tambe, Milind | Cambridge University Press 2012

Ouvrage

- xiv; 319 p.
ISBN 978-1-107-09642-4

Localisation : Ouvrage RdC (TAMB)

sécurité informatique # théorie des jeux # modèle mathématique # sécurité internationale

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## Advances in dynamic game theory :numerical methods, algorithms, and applications to ecology and economics Jorgensen, Steffen ; Quincampoix, Marc ; Vincent, Thomas L. | Springer 2007

Ouvrage

- 717 p.
ISBN 978-0-8176-4399-7

Annals of the international society of dynamic games , 0009

théorie des jeux dynamiques # jeux coopératifs et non coopératifs # jeux stochastiques # jeux d'évolution # jeux différentiels # jeux de poursuite # application de la théorie des jeux à l'économie # modèles théoriques # méthodes numériques

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## Models of adaptive behaviour :an approach based on state Houston, Alasdair I. ; McNamara, John M. | Cambridge University Press 1999

Ouvrage

- 378 p.
ISBN 978-0-521-65539-2

Localisation : Ouvrage RdC (HOUS)

adaptation # évolution # modèle mathématique # maximisation # jeu dynamique # optimisation dynamique # énergie # sélection naturelle

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## An introduction to game-theroretic modelling Mesterton-Gibbons, Michael | American Mathematical Society 2000

Ouvrage

- 368 p.
ISBN 978-0-8218-1929-6

Student mathematical library , 0011

Localisation : Collection 1er étage

théorie des jeux # modèle théorique de jeux # théorie de la décision # jeu non-coopératif # jeu coopératif # dilemme du prisonnier # jeu de stratégie

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## The game's afoot ! game theory in myth and paradox Mehlmann, Alexander ; Kramer David | American Mathematical Society 2000

Ouvrage

ISBN 978-0-8218-2121-3

Student mathematical library , 0005

Localisation : Collection 1er étage

calcul stratégique # dilemme du prisonier # jeu à deux personnes # loisir # mathématique récréative # modèle théorique de jeu # paradoxe # théorie des jeux

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