回複：Try one more time; please ignore my earlier posts

來源: HF: 於 2009-01-03 20:58:27 [] [舊帖] [給我悄悄話] 閱讀數 : (101 bytes)

case 2 should be for x = y
case 3 x = y = z can be proved using the same method of case 2.

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