For double limit of a binary function, the existence of the limit and the methods to seek its solution are emphasis among our focus.

对于二元函数的二重极限，重点是极限的存在性及其求解方法。

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The criterion extreme value of binary function for first partial derivative is given by means of the mean value theorem. The two theorems are obtained.

以中值定理为工具，给出了利用一阶偏导数判定二元函数极值的方法。

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A discussion of the relations between continuity, partial derivative, directional derivative and differentiability of binary function is helpful for us to study binary function.

探讨二元函数的连续性、偏导数、方向导数以及可微性之间的关系，有助于我们对二元函数的学习。

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For him, normal life and vacation cease to function as the two binary options for how he spends his time.

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