推 zzzxxxqqq :假設有限，半徑再取比最小還小，矛盾 10/19 12:10
→ zzzxxxqqq :....推錯文 10/19 12:11
推 zombiea :consult #4199 Limsine 10/19 13:18
→ bineapple :很詳細的解答 感謝!! 10/19 14:04
f:[0,1]→R
If for any y in R, either there is no or exactly two values of x in [0,1]
for which f(x)=y, show that f has infinitely many discontinuities on [0,1].
我已經會證明至少有一個了
可是不知道該如何推廣到有無限個
有強者可以給點提示嗎? 謝謝~~
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