Logic in Classical and Evolutionary Games Stefanie Kooistra Abstract: Investigating the logical structure of classical game theory is an increasingly popular topic among logicians. However, evolutionary game theory, which is an extension of classical game theory designed to describe natural selection, has seen little application of logic. Investigating the consequences two crucial differences between the two will reveal how to approach a logic for evolutionary game theory. The two differences are: 1. the interpretation of the classical terminology and 2. the nature of the role of rationality. By making a new interpretation of the logical terms and taking a new perspective on rationality, it is possible to achieve an initial logical formulation for evolutionary game theory.