We present a new proof of the interiority of the policy function based on the Inada conditions. It is based on supporting properties of concave functions.

In 1975 Selten introduced trembling-hand perfection, however it was implicitly assumed that specific values of rationality imperfections are common knowledge. Relaxing this assumption, we develop the notion of trembling-hand myopia, and completely characterize equilibria which are robust in this...

We present some proofs of the existence of the minimax point of a strategic game that does not seem to be available in the literature. The existence of the minimax point plays an important role in the theory of games.