[分析] Polytopes
Let A be convex and p 屬於 A. Then there is a unique maximal affine
subspace Z with p 屬於 Z 包含在 A 裡.
pf:If Z_1,Z_2 are two affine spaces passing through p, then the convex
envelope of Z_1聯集Z_2 coincides with the affine space Z_1 + Z_2 - p
generated by Z_1聯集Z_2. The statement follows.
我不懂為什麼這樣就證完命題了?????
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