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Let f:A 包含於 R -> R
Assume that for some integer k,△k < 0 where △k is evaluated at Xo .
Show that f cannot have a (local) minimum at Xo
目前想到的證明法是用反證,先假設f have local minimum at Xo
然後在帶入△k的判斷法去做..
不過在△k的部份我只會用來判斷minimum和maximum,拿來證明的部份不會做...
希望有高手能幫忙指點QQ
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