That means a can take any number except real number.

来源: jinjing 于 2011-07-24 17:27:52 [档案] [旧帖] [给我悄悄话] 阅读数 : (0 bytes)

回答: ...some special complex singular points is empt set. 由 jinjing 于 2011-07-21 07:39:43

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