take out remote E-SInE -- it's broken and Geoff says it might take quite a while before he gets to it, plus it's fairly obsolete in the meantime
Gate = FOL +
consts nand,xor :: "[o,o] => o"
rules nand_def "nand(P,Q) == ~(P & Q)"
xor_def "xor(P,Q) == P & ~Q | ~P & Q"
end