[線代] 一題證明
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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