作者mqazz1 (無法顯示)
看板Math
標題[離散] 長方形分割
時間Sun Oct 10 20:11:05 2010
A 3*7 rectangle is divided into 21 squares each of which is colored red
or black.
Prove that the board contains a nontrivial rectangle (not 1*k or k*1)
whose four corner squares are all black or all red.
請問這題在問什麼呢?
又應該怎麼證明呢?
謝謝
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