二元函数的极限远比一元函数的极限复杂，但它们之间又有密切的联系。

Limit of function of two variables is more complex than that of one variable.

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并讨论说明了导函数的右(左)极限与右(左)导数之间的关系。

And demonstrates the relations between the right (left) limit of function and right (left) derivative.

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初始蠕变极限可以表示成稳态蠕变率的函数。

Transient creep limit is a power function of steady state creep strain rate.

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使用函数极限的定义；

Use the limit definition of the function;

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使用函数极限的定义；

Use the limit definition of the function;

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