YES exiting with thread! (VAR x y z ) (RULES inverse(identity) -> identity multiply(inverse(x),x) -> identity inverse(inverse(x)) -> x multiply(identity,x) -> x multiply(y,inverse(y)) -> identity multiply(x,identity) -> x multiply(inverse(x),multiply(x,y)) -> y multiply(x,multiply(inverse(x),y)) -> y inverse(multiply(x,y)) -> multiply(inverse(y),inverse(x)) double_divide(x,y) -> multiply(inverse(x),inverse(y)) multiply(multiply(z,x),y) -> multiply(z,multiply(x,y)) )