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Via Freedom to Coercion: The Emergence of Costly Punishment
(American Association for the Advancement of Science, 2007)
In human societies, cooperative behavior in joint enterprises is often enforced through institutions that impose sanctions on defectors. Many experiments on so-called public goods games have shown that in the absence of ...
Nearly Ordinary Galois Deformations over Arbitrary Number Fields
(Cambridge University Press, 2009)
Let \(K\) be an arbitrary number field, and let \(\rho: Gal(K \bar/K) \rightarrow GL_2(E)\) be a nearly ordinary irreducible geometric Galois representation. In this paper, we study the nearly ordinary deformations of ...
Twisting Commutative Algebraic Groups
(Elsevier, 2007)
If \(V\) is a commutative algebraic group over a field \(k\), [View the MathML] source is a commutative ring that acts on \(V\), and View the MathML source is a finitely generated free View the MathML source-module with ...
Hecke Operators on Quasimaps into Horospherical Varieties
(University Bielefeld, Fakultat Mathematik, 2009)
Let G be a connected reductive complex algebraic group. This paper and its companion [GN06] are devoted to the space Z of meromorphic quasimaps from a curve into an affine spherical G-variety X. The space Z may be thought ...
Strategy Abundance in 2×2 Games for Arbitrary Mutation Rates
(Elsevier, 2009)
We study evolutionary game dynamics in a well-mixed populations of finite size, N. A well-mixed population means that any two individuals are equally likely to interact. In particular we consider the average abundances of ...
The Replicator Equation on Graphs
(Elsevier, 2006)
We study evolutionary games on graphs. Each player is represented
by a vertex of the graph. The edges denote who meets whom. A player can use any one of n strategies. Players obtain a payoff from interaction with all their ...
Synergy and Discounting of Cooperation in Social Dilemmas
(Elsevier, 2006)
The emergence and maintenance of cooperation by natural selection is an enduring conundrum in evolutionary biology, which has been studied using a variety of game theoretical models inspired by different biological situations. ...
A Symmetry of Fixation Times in Evoultionary Dynamics
(Elsevier, 2006)
In this paper, we show that for evolutionary dynamics between two types that can be described by a Moran process, the conditional fixation time of either type is the same irrespective of the selective scenario. With frequency ...
Indirect Reciprocity Provides Only a Narrow Margin of Efficiency for Costly Punishment
(Nature Publishing Group, 2009)
Indirect reciprocity is a key mechanism for the evolution of human cooperation. Our behaviour towards other people depends not only on what they have done to us but also on what they have done to others. Indirect reciprocity ...
Prelife Catalysts and Replicators
(Royal Society, The, 2009)
Life is based on replication and evolution. But replication cannot be taken for granted. We must ask what there was prior to replication and evolution. How does evolution begin? We have proposed prelife as a generative ...