YES TRS: exp(x,0()) -> s(0()) exp(x,s(y)) -> *(x,exp(x,y)) *(0(),y) -> 0() *(s(x),y) -> +(y,*(x,y)) -(0(),y) -> 0() -(x,0()) -> x -(s(x),s(y)) -> -(x,y) max/plus interpretations on N: exp_A(x1,x2) = max{2, -5 + x1, -1} exp#_A(x1,x2) = max{8, 1 + x1, 3} 0_A = 1 0#_A = 4 s_A(x1) = max{2, 1 + x1} s#_A(x1) = max{0, 2} *_A(x1,x2) = max{2, -5, 1} *#_A(x1,x2) = max{7, 7, 5 + x2} +_A(x1,x2) = max{2, -5, -5} +#_A(x1,x2) = max{6, 4, 7} -_A(x1,x2) = max{0, x1, 0} -#_A(x1,x2) = max{3, 5, 6} precedence: exp > s = * = - > 0 = +