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A=B B=A可否出现?

Posted by suzhan at 2005-01-29 16:13:55 on Problem 1820
假如有定义
A=B
B=A
C=(1)
D=(1 2)
很显然,a-d的任何规则都判定不出A!=C,则有A=C,同理,A=D,由规则d,C=D。
太荒谬了……

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