Wed, 21 Feb 2001 12:07:00 +0100 oheimb added split_conv_tac (also to claset()) as an optimization
Tue, 20 Feb 2001 18:53:28 +0100 oheimb made split_all_tac safe introducing safe_full_simp_tac, EXISTING PROOFS MAY FAIL
Tue, 20 Feb 2001 18:48:34 +0100 oheimb simplified proofs for splitI and splitD, added splitD'
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