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src/FOL/fol.thy
author wenzelm
Tue, 27 May 1997 15:45:07 +0200
changeset 3362 0b268cff9344
parent 0 a5a9c433f639
permissions -rw-r--r--
NJ 1.09.2x as factory default!

FOL = IFOL +
rules
classical "(~P ==> P) ==> P"
end
isabelle