Thu, 10 Oct 1996 11:09:03 +0200 paulson Removed LK since Sequents contains everything in it
Thu, 10 Oct 1996 10:57:33 +0200 paulson New root file with more description, and merging LK and Modal to Sequents
Thu, 10 Oct 1996 10:47:26 +0200 paulson Tidied some proofs: changed needed for de Morgan laws
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