有限策略的两人博弈 S1={s11,s12rS13}S2=s21,S22} (s11s2)是一个纳什均衡,如果 1121 11(s 1221r 11(S 1 11 21)≥1(s13,s21)并且 11/=21 1122 Player 2 s1a1(s1821),v2(s1,s2)u1(s1,s2),a2(s1182) Player1s12u2(s12,s21),u(s12,2) u(s1222), 2(s12S22) 13 u1(s13,S21),u2( S13r521 )a1(s13,s2),v2(s13,52)有限策略的两人博弈  S 1={ s11, s12, s13} S 2={ s21, s22 }  ( s 1 1 , s21 ) 是 个纳什均衡 一 ，如果 u 1 ( s11 , s21)  u 1 ( s12 , s21), u 1 ( s11 , s21 )  u 1 ( s13 , s21 ) 并且 u 2 ( s11 , s21)  u 2 ( s11 , s22 ). Player 2 s21 s22 Pl 1 s11 u 1(s11,s21), u 2(s11,s21) u 1(s11,s22), u 2(s11,s22) Player 1 s u (s s ) u (s s ) u (s s ) u (s s ) 12 u 1(s 1 2,s 2 1), u 2(s 1 2,s 2 1) u 1(s 1 2,s 2 2), u 2(s 1 2,s 2 2) s13 u 1(s13,s21), u 2(s13,s21) u 1(s13,s22), u 2(s13,s22) 5