Thu, 31 May 2001 16:50:15 +0200 added injective_fst_snd
oheimb [Thu, 31 May 2001 16:50:15 +0200] rev 11339
added injective_fst_snd
Thu, 31 May 2001 16:50:14 +0200 added nat_not_singleton (also to simpset)
oheimb [Thu, 31 May 2001 16:50:14 +0200] rev 11338
added nat_not_singleton (also to simpset)
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