Fri, 18 Oct 1996 11:39:10 +0200 paulson Important correction to comment
Fri, 18 Oct 1996 11:38:17 +0200 paulson Replaced excluded_middle_tac by case_tac; tidied proofs
Fri, 18 Oct 1996 11:37:19 +0200 paulson Tidied up the proof of A_trust_NS4
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