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

来源: HF: 于 2009-01-03 20:58:27 [] [旧帖] [给我悄悄话] 阅读数 : (101 bytes)

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

请您先登陆，再发跟帖！