推 tryitredboy :了解!! 12/04 01:43
※ 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
f(x) = arctan(x) 算吧?
永遠到不了π/2
以及-π/2
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