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guan yu qiu dao ci xu de ke jiao huan wen ti
Author(s): 
Pages: 21-22
Year: Issue:  2
Journal: JOURNAL OF HIGHER CORRESPONDENCE EDUCATION(NATURAL SCIENCE)

Keyword:  充分条件求导次序交换;
Abstract: 本文以二元函数为例讨论了f"xy(x0,y0)=f"yx(x0,y0)成立的条件,给出了两个比现行教材更弱的f"xy(x0,y0)=f"yx(x0,y0)成立的充分条件.
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