来自《耶鲁大学开放课程：博弈论 第16集 第16集》

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  He hasn't learned anything
  他不需要了解任何东西
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  because whether Ale was sane or crazy
  因为无论埃里是真疯还是正常
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  he's going to fight.
  他都会进入者攻击
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  So observing what his actions early on,
  通过观察他之前的行为
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  if that was really an equilibrium,
  如果真的存在均衡的情况
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  our tenth guy wouldn't have updated his belief at all,
  我们的第十个市场不需要重新考虑
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  and therefore,
  因此
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  would still believe
  他仍然认为
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  with probability .99 that Ale was sane,
  是有百分之九十九的机率埃里是正常的
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  in which case our tenth guy would enter.
  因此安迪还是会进入
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  Once again, that argument would unravel from the back.
  我们同样从后面来倒推这个问题
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  So what I described before can't quite be an equilibrium.
  我之前所说的并不是均衡