...二重积分; Taylor公式 [gap=526] Counter-evidence method; Monotonicity; Lang's langrangian middle value theorem; The double integral; Taylor formula ...
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The area R is the double integral over R of a function one.
区域R的面积是函数1在R上的二重积分。
So, if a curl was well defined at the origin, you would try to, then, take the double integral.
如果旋度在原点有定义，你就可以试试了，计算二重积分。
One example that we did, in particular, was to compute the double integral of a quarter of a unit disk.
我们已经做过的一个例子是，计算四分之一单位圆上的二重积分。
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