YES We show the termination of the TRS R: times(x,|0|()) -> |0|() times(x,s(y)) -> plus(times(x,y),x) plus(x,|0|()) -> x plus(|0|(),x) -> x plus(x,s(y)) -> s(plus(x,y)) plus(s(x),y) -> s(plus(x,y)) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: times#(x,s(y)) -> plus#(times(x,y),x) p2: times#(x,s(y)) -> times#(x,y) p3: plus#(x,s(y)) -> plus#(x,y) p4: plus#(s(x),y) -> plus#(x,y) and R consists of: r1: times(x,|0|()) -> |0|() r2: times(x,s(y)) -> plus(times(x,y),x) r3: plus(x,|0|()) -> x r4: plus(|0|(),x) -> x r5: plus(x,s(y)) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(x,y)) The estimated dependency graph contains the following SCCs: {p2} {p3, p4} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: times#(x,s(y)) -> times#(x,y) and R consists of: r1: times(x,|0|()) -> |0|() r2: times(x,s(y)) -> plus(times(x,y),x) r3: plus(x,|0|()) -> x r4: plus(|0|(),x) -> x r5: plus(x,s(y)) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(x,y)) The set of usable rules consists of (no rules) Take the reduction pair: generalized weighted path order (>=MG, >MG) base order 1: max/plus interpretation on natural numbers: times#_A(x1,x2) = max{4, x2 + 2} s_A(x1) = max{14, x1 + 3} base order 2: precedence: s > times# partial status: pi(times#) = [2] pi(s) = [1] The following rules are removed: p1 Then no dependency pair remains. -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: plus#(x,s(y)) -> plus#(x,y) p2: plus#(s(x),y) -> plus#(x,y) and R consists of: r1: times(x,|0|()) -> |0|() r2: times(x,s(y)) -> plus(times(x,y),x) r3: plus(x,|0|()) -> x r4: plus(|0|(),x) -> x r5: plus(x,s(y)) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(x,y)) The set of usable rules consists of r3 Take the reduction pair: generalized weighted path order (>=MG, >MG) base order 1: max/plus interpretation on natural numbers: plus#_A(x1,x2) = x1 + 2 s_A(x1) = max{5, x1 + 3} plus_A(x1,x2) = max{1, x1} |0|_A = 3 base order 2: precedence: s > plus# = |0| > plus partial status: pi(plus#) = [1] pi(s) = [] pi(plus) = [1] pi(|0|) = [] The following rules are removed: p2 -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: plus#(x,s(y)) -> plus#(x,y) and R consists of: r1: times(x,|0|()) -> |0|() r2: times(x,s(y)) -> plus(times(x,y),x) r3: plus(x,|0|()) -> x r4: plus(|0|(),x) -> x r5: plus(x,s(y)) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(x,y)) The estimated dependency graph contains the following SCCs: {p1} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: plus#(x,s(y)) -> plus#(x,y) and R consists of: r1: times(x,|0|()) -> |0|() r2: times(x,s(y)) -> plus(times(x,y),x) r3: plus(x,|0|()) -> x r4: plus(|0|(),x) -> x r5: plus(x,s(y)) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(x,y)) The set of usable rules consists of r3 Take the reduction pair: generalized weighted path order (>=MG, >MG) base order 1: max/plus interpretation on natural numbers: plus#_A(x1,x2) = max{x1 + 4, x2 + 4} s_A(x1) = max{2, x1} plus_A(x1,x2) = max{4, x1 + 1, x2 - 3} |0|_A = 0 base order 2: precedence: plus > plus# > s = |0| partial status: pi(plus#) = [2] pi(s) = [1] pi(plus) = [1] pi(|0|) = [] The following rules are removed: p1 Then no dependency pair remains.