Quotient of smooth functions消失
Prove or disprove
Suppose f,g are real valued smooth functions on the real line R. If f(0)=g(0)=
0, f(x)=/=0, g(x)=/=0 for all nonzero x , then either f/g or g/f extends to a
smooth function on R.
我猜有反例,不過我造不出來。請各位高手救一下。
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※ 編輯: hyl770706 (140.112.51.104), 09/27/2018 14:41:49