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