→ yyc2008 :反證不是一下子就出來? 11/01 10:18
→ recorriendo :反證要怎麼弄? 感覺逆否命題跟原命題沒差多少 11/01 10:43
推 WINDHEAD :題目是錯的,你要加上 dim M = n-1 之類的條件 11/01 10:58
→ WINDHEAD :至於證法,我不知道你所謂的簡單是多簡單 XD 11/01 11:14
→ recorriendo :dim M=n-1 的話 怎麼證? 11/01 12:12
Let M be a subspace in R^n, y be a point in R^n.
Suppose for all m in M, at least one coordinate of (y-m) is nonnegative.
Show that there is m' in M such that all coordinates of (y-m') is nonnegative.
請問版上高手這題有沒有什麼簡單的證法???
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