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, >G) base order 1: trivial reduction triple (T x T, T x T, Φ) base order 2: lexicographic combination of reduction triples: 1. marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: times#_A(x1,x2) = x2 s_A(x1) = x1 + 1 times#!_A(x1,x2) = x2 s!_A(x1) = x1 + 1 2. marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: times#_A(x1,x2) = x2 s_A(x1) = x1 + 1 times#!_A(x1,x2) = 1 s!_A(x1) = 2 partial status: pi(times#) = [] 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 (no rules) Take the reduction pair: generalized weighted path order (>=MG, >G) base order 1: trivial reduction triple (T x T, T x T, Φ) base order 2: lexicographic combination of reduction triples: 1. marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: plus#_A(x1,x2) = x1 + x2 s_A(x1) = x1 + 1 plus#!_A(x1,x2) = x1 + x2 + 4 s!_A(x1) = 3 2. marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: plus#_A(x1,x2) = x1 + x2 s_A(x1) = x1 + 1 plus#!_A(x1,x2) = x1 + x2 + 2 s!_A(x1) = 1 partial status: pi(plus#) = [2] pi(s) = [1] The following rules are removed: p1, p2 Then no dependency pair remains.