[問題] 多變數連續可微性
f:R^n ---> R^m
Prove if df_i/dx_k (a) exists for every i,k
and df_i/dx_k is continuous,then f is total differentiable .
我知道偏導數存在便可自制微分矩陣 但不知道偏微分的連續性在這的意義
一直都解不出 麻煩各位大大了><
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