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src/FOL/fol.thy
author
wenzelm
Sat, 01 Apr 2000 20:09:52 +0200
changeset 8647
656f1b61875a
parent 0
a5a9c433f639
permissions
-rw-r--r--
added ProofGeneral.undo;
FOL = IFOL +
rules
classical "(~P ==> P) ==> P"
end