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src/FOL/fol.thy
author wenzelm
Mon, 20 Oct 1997 10:38:36 +0200
changeset 3932 436463f9f2b4
parent 0 a5a9c433f639
permissions -rw-r--r--
local;

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