YES (VAR x0 x1 x2) (RULES multiply(multiply(x0,x1),x2) -> multiply(x0,multiply(x1,x2)) inverse(multiply(x0,x1)) -> multiply(inverse(x1),inverse(x0)) multiply(inverse(x0),multiply(x0,x1)) -> x1 multiply(x1,multiply(inverse(x1),x0)) -> x0 double_divide(x1,x0) -> multiply(inverse(x1),inverse(x0)) multiply(x0,inverse(x0)) -> identity() multiply(identity(),x0) -> x0 multiply(inverse(x0),x0) -> identity() multiply(x0,identity()) -> x0 inverse(inverse(x0)) -> x0 inverse(identity()) -> identity() ) (COMMENT Termination is shown by ELPO with interpretations on natural numbers double_divide_A(x1,x2) = x1 + x2 + 2 identity_A = 1 multiply_A(x1,x2) = x1 + x2 + 1 inverse_A(x1) = x1 identity#_A = 0 inverse#_A(x1) = 0 and precedence: double_divide > inverse > multiply > identity )