two comments...

来源: dynamic 于 2009-04-25 02:48:44 [] [旧帖] [给我悄悄话] 阅读数 : (275 bytes)
本帖于 2009-04-30 07:14:03 时间, 由普通用户 康MM 编辑
回答: 朋友们试试这个，不知道几星 由 群众丁 于 2009-04-22 09:04:08

1. the proof of claim 2 is correct but incomplete. the border grids need to be discussed separately.

2. the construction only works for n mod 4 = 1. If n mod 4 = 3, then the number of red grids in claim 2 and 3 are the same. let me think what to do in this case...

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