[微積] R^n上的可微
f:R^n→R Show f is differentiable at x belong to R^n
=>f is continuous at x
我目前只會R送到R,可以請問一下這題的話要怎麼證
有反例說明連續但不可微嗎(這部分我也只在R送到R上找到)
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