Thu, 16 Nov 2000 22:33:14 +0100 wenzelm Proof.assert_forward;
Thu, 16 Nov 2000 19:03:26 +0100 wenzelm added not_equiv_sym, not_equiv_trans1/2;
Thu, 16 Nov 2000 19:01:39 +0100 wenzelm added abs_mult, abs_eq_0, square_nonzero;
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