在大牛M.J.Osborne的A Course in Game Theory这本书的第33页,有一个引理(LEMMA)33.2,如此说到

然后后面有个评论是这么说的,It follows that every action in the support of any player's equilibrium
mixed strategy yields that player the same payoff.希望读过A Course in Game Theory的大牛粗线帮我解释下这个lemma的含义和后面评论所指出的东西.小可不胜感激.