YES (VAR x0 x1 x y z) (RULES inverse(multiply(x0,x1)) -> multiply(inverse(x1),inverse(x0)) b() -> d() multiply(x1,multiply(inverse(x1),x0)) -> x0 multiply(x0,inverse(x0)) -> identity() inverse(inverse(x0)) -> x0 inverse(identity()) -> identity() multiply(x0,identity()) -> x0 multiply(inverse(x1),multiply(x1,x0)) -> x0 multiply(inverse(x),x) -> identity() multiply(identity(),x) -> x multiply(multiply(x,y),z) -> multiply(x,multiply(y,z)) ) (COMMENT Termination is shown by LPO with precedence: c > inverse > multiply > identity > b > d )