Two-person games

According to the general definition of a game a two-person game Γis given by strategy sets { Σ1, Σ2} and pay-off functions K1: Σ1 x Σ2,→ → ℝ K2: Σ1 x Σ2 ℝ. We write briefly:= Γ {Σ1, Σ2; K1, K2}.