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Answers for “为什么区域 D 是单连通的对于通过围道积分定义原函数 F(z) 很重要?”

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The explicit formula for the antiderivative F(z)F(z) of a holomorphic function ff on a domain DD is given by the contour integral of f(w)f(w) along a path γz\gamma_z from a fixed base point z0z_0 to zz. The formula is F(z):=∫γzf(w)dwF(z) := \int_{\gamma_z} f(w) dw.

Conditions: The function f is holomorphic on the domain D.; The domain D is simply connected (ensuring path independence).; A base point z0z_0 is fixed in D.; γz\gamma_z is a path in D from z0z_0 to z.