Skills and examples to define double limit with transformation of polar coordinates 用极坐标变换确定二重极限的技巧及实例
2.
The uncertain relationship between the double limit ond the quadratic limit is explained and the determination methods to the nonexistence of the odd function ' s limit are given 摘要本文阐明二重极限与二次极限的不确定关系，给出齐次函数的极限不存在的判定方法。
