YES TRS: minus(minus(x)) -> x minus(+(x,y)) -> *(minus(minus(minus(x))),minus(minus(minus(y)))) minus(*(x,y)) -> +(minus(minus(minus(x))),minus(minus(minus(y)))) f(minus(x)) -> minus(minus(minus(f(x)))) max/plus interpretations on N: minus_A(x1) = max{2, x1} minus#_A(x1) = max{2, x1} +_A(x1,x2) = max{8, 3 + x1, 6 + x2} +#_A(x1,x2) = max{8, 3 + x1, 6 + x2} *_A(x1,x2) = max{8, 3 + x1, 6 + x2} *#_A(x1,x2) = max{8, 3 + x1, 6 + x2} f_A(x1) = max{3, 1 + x1} f#_A(x1) = max{3, 1 + x1} precedence: f > minus > * > +