来自《耶鲁大学开放课程：金融理论 第4集 第4集》

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  and we can replace this maximization by recognizing that
  然后我们就可以通过重组来替换最大值化
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  X^ is just a function of X^.
  X^b就恰好是X^a的函数
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  In fact, it's a very special function where the derivative of
  事实上它是非常特别的函数
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  X^ with respect to X^--
  因为他的X^a和X^b的导数...
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  so let's call the function,
  我们叫他函数吧
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  we'll call it that to denote that it's a function--
  我们把这种赋值叫做函数
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  happens to equal -1.
  恰好等于-1
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  So we want to maximize this over X^ taking into account
  我们希望通过将X^a考虑在内打到最大化
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  that X^ is just a function of X^,
  这个X^a就是X^b的函数
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  because to maximize you have to keep feasible.
  因为如果要最大化就必须要保持其可行性
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  So we've now ignored all the constraints.
  我们已经忽略了所有限制因素
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  Constraints have now disappeared provided we keep
  如果我们继续认为X^a是X^b的函数