Thu, 08 Jul 1999 18:37:54 +0200 added export_chain;
wenzelm [Thu, 08 Jul 1999 18:37:54 +0200] rev 6937
added export_chain; propp: 'concl' patterns; terminal_proof: 2nd method; use Display.pretty_thm_no_hyps;
Thu, 08 Jul 1999 18:36:57 +0200 propp: 'concl' patterns;
wenzelm [Thu, 08 Jul 1999 18:36:57 +0200] rev 6936
propp: 'concl' patterns; added 'thence';
Thu, 08 Jul 1999 18:36:09 +0200 propp: 'concl' patterns;
wenzelm [Thu, 08 Jul 1999 18:36:09 +0200] rev 6935
propp: 'concl' patterns;
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