This is congruent with their assumption that human beings are rational. That is a contradiction that follows from the assumption that is rational. Notions such as prime numbers and rational and irrational numbers are introduced. The assumption of a perfectly rational economic actor is unrealistic. This process is fundamentally rational and analytical. Game theory is the study of mathematical models of strategic interaction among rational decision-makers. She supported rational and ethical egoism and rejected altruism. Microeconomic theory typically begins with the study of a single rational and utility maximizing individual. Mbeki was seen as pragmatic, eloquent, rational and urbane. This opened the way to the study of the theory of iterations of rational functions. Decision making works best with a mix of rational, intuitive and emotional thinking. This is usually done in a rational and systematic manner. The Ideas of Rational Cosmology are dialectical. Delinquency is one of the major factors motivated by rational choice. Ellis created what he called the ABC Technique of rational beliefs.