src/FOL/fol.thy
author wenzelm
Wed, 06 Aug 1997 14:42:44 +0200
changeset 3631 88a279998f90
parent 0 a5a9c433f639
permissions -rw-r--r--
renamed use_string to use_strings;

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