※ 引述《tryitredboy (dsd)》之銘言：
: Marsden p.191 1.
: give an example of a continuous and bounded function on all of lR
: that does not attain its maximum or minimum
臨時想是想不出來的, 倒是國中有學過反比, f(x) = 1/x,
可以從 f(x) 拼出想要的 continuous & bounded function,
多點創造力一定可以湊出來!
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