There are two aspects of it. Thus far, the problem sets have mostly focused on function.

关于这个问题有两个方面，迄今，问题集只关注了方法。

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This is a discontinuous payoff function, so differentiating isn't going to get you very far.

这是一个不连续的收益函数,所以不会涉及太多微分的东西

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