first stage in tidying up Real and Hyperreal.
Factor cancellation simprocs
inverse #0 = #0
simprules for division
corrected ambigous syntax definitions in Hyperreal
Defs = Types +
consts nand, exor :: gate
defs nand_def "nand A B == ~(A & B)"
exor_def "exor A B == A & ~B | ~A & B"
end