函数极限定义证明中的“适当放大”

"Proper Enlarging"in the proving of Definition of Function-limit

结合例题说明在用函数极限的“ε—X”及“ε—δ”定义证明函数的极限时,如何进行“适当放大”。

with examples the author illustrates how to do with proper enlarging when using the definition of： “ε-X” and “ε-δ” of function--limit to prove function-limit.