YES We show the termination of the TRS R: times(x,plus(y,s(z))) -> plus(times(x,plus(y,times(s(z),|0|()))),times(x,s(z))) times(x,|0|()) -> |0|() times(x,s(y)) -> plus(times(x,y),x) plus(x,|0|()) -> x plus(x,s(y)) -> s(plus(x,y)) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: times#(x,plus(y,s(z))) -> plus#(times(x,plus(y,times(s(z),|0|()))),times(x,s(z))) p2: times#(x,plus(y,s(z))) -> times#(x,plus(y,times(s(z),|0|()))) p3: times#(x,plus(y,s(z))) -> plus#(y,times(s(z),|0|())) p4: times#(x,plus(y,s(z))) -> times#(s(z),|0|()) p5: times#(x,plus(y,s(z))) -> times#(x,s(z)) p6: times#(x,s(y)) -> plus#(times(x,y),x) p7: times#(x,s(y)) -> times#(x,y) p8: plus#(x,s(y)) -> plus#(x,y) and R consists of: r1: times(x,plus(y,s(z))) -> plus(times(x,plus(y,times(s(z),|0|()))),times(x,s(z))) r2: times(x,|0|()) -> |0|() r3: times(x,s(y)) -> plus(times(x,y),x) r4: plus(x,|0|()) -> x r5: plus(x,s(y)) -> s(plus(x,y)) The estimated dependency graph contains the following SCCs: {p2, p5, p7} {p8} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: times#(x,s(y)) -> times#(x,y) p2: times#(x,plus(y,s(z))) -> times#(x,s(z)) p3: times#(x,plus(y,s(z))) -> times#(x,plus(y,times(s(z),|0|()))) and R consists of: r1: times(x,plus(y,s(z))) -> plus(times(x,plus(y,times(s(z),|0|()))),times(x,s(z))) r2: times(x,|0|()) -> |0|() r3: times(x,s(y)) -> plus(times(x,y),x) r4: plus(x,|0|()) -> x r5: plus(x,s(y)) -> s(plus(x,y)) The set of usable rules consists of r2, r4, r5 Take the reduction pair: generalized weighted path order (>=MG, >G) base order 1: matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: times#_A(x1,x2) = 5 s_A(x1) = 6 plus_A(x1,x2) = x1 + 7 times_A(x1,x2) = 4 |0|_A() = 3 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: times#_A(x1,x2) = max{0, x1 - 138, x2 - 33} s_A(x1) = max{4, x1} plus_A(x1,x2) = max{x1 + 32, x2 + 6} times_A(x1,x2) = max{26, x1 - 114, x2 - 65} |0|_A = 5 times#!_A(x1,x2) = max{6, x2 + 1} s!_A(x1) = max{80, x1 + 4} plus!_A(x1,x2) = max{x1 + 113, x2 + 72} times!_A(x1,x2) = max{78, x1 - 5, x2 + 46} |0|!_A = 5 partial status: pi(times#) = [] pi(s) = [] pi(plus) = [1] pi(times) = [] pi(|0|) = [] The following rules are removed: p2 -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: times#(x,s(y)) -> times#(x,y) p2: times#(x,plus(y,s(z))) -> times#(x,plus(y,times(s(z),|0|()))) and R consists of: r1: times(x,plus(y,s(z))) -> plus(times(x,plus(y,times(s(z),|0|()))),times(x,s(z))) r2: times(x,|0|()) -> |0|() r3: times(x,s(y)) -> plus(times(x,y),x) r4: plus(x,|0|()) -> x r5: plus(x,s(y)) -> s(plus(x,y)) The estimated dependency graph contains the following SCCs: {p1, p2} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: times#(x,s(y)) -> times#(x,y) p2: times#(x,plus(y,s(z))) -> times#(x,plus(y,times(s(z),|0|()))) and R consists of: r1: times(x,plus(y,s(z))) -> plus(times(x,plus(y,times(s(z),|0|()))),times(x,s(z))) r2: times(x,|0|()) -> |0|() r3: times(x,s(y)) -> plus(times(x,y),x) r4: plus(x,|0|()) -> x r5: plus(x,s(y)) -> s(plus(x,y)) The set of usable rules consists of r2, r4, r5 Take the reduction pair: generalized weighted path order (>=MG, >G) base order 1: matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: times#_A(x1,x2) = x2 s_A(x1) = x1 + 1 plus_A(x1,x2) = x1 + x2 + 2 times_A(x1,x2) = x1 |0|_A() = 0 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: times#_A(x1,x2) = max{0, x1 - 1} s_A(x1) = 11 plus_A(x1,x2) = max{12, x1 + 10} times_A(x1,x2) = max{1, x2 - 14} |0|_A = 1 times#!_A(x1,x2) = 17 s!_A(x1) = max{16, x1 - 1} plus!_A(x1,x2) = max{19, x1 + 14, x2 - 6} times!_A(x1,x2) = max{18, x1 - 7, x2 - 5} |0|!_A = 15 partial status: pi(times#) = [] pi(s) = [1] pi(plus) = [] pi(times) = [] pi(|0|) = [] The following rules are removed: p1 -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: times#(x,plus(y,s(z))) -> times#(x,plus(y,times(s(z),|0|()))) and R consists of: r1: times(x,plus(y,s(z))) -> plus(times(x,plus(y,times(s(z),|0|()))),times(x,s(z))) r2: times(x,|0|()) -> |0|() r3: times(x,s(y)) -> plus(times(x,y),x) r4: plus(x,|0|()) -> x r5: plus(x,s(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: times#(x,plus(y,s(z))) -> times#(x,plus(y,times(s(z),|0|()))) and R consists of: r1: times(x,plus(y,s(z))) -> plus(times(x,plus(y,times(s(z),|0|()))),times(x,s(z))) r2: times(x,|0|()) -> |0|() r3: times(x,s(y)) -> plus(times(x,y),x) r4: plus(x,|0|()) -> x r5: plus(x,s(y)) -> s(plus(x,y)) The set of usable rules consists of r2, r4, r5 Take the reduction pair: generalized weighted path order (>=MG, >G) base order 1: matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: times#_A(x1,x2) = x2 + 1 plus_A(x1,x2) = x1 + 2 s_A(x1) = x1 times_A(x1,x2) = x1 + 4 |0|_A() = 1 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: times#_A(x1,x2) = max{0, x1 - 90, x2 - 7} plus_A(x1,x2) = max{6, x1 + 3, x2 - 10} s_A(x1) = max{6, x1 - 7} times_A(x1,x2) = max{5, x1 - 78, x2 - 36} |0|_A = 2 times#!_A(x1,x2) = x2 + 27 plus!_A(x1,x2) = x2 + 28 s!_A(x1) = 3 times!_A(x1,x2) = max{2, x2 - 4} |0|!_A = 1 partial status: pi(times#) = [2] pi(plus) = [1] pi(s) = [] pi(times) = [] pi(|0|) = [] 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) and R consists of: r1: times(x,plus(y,s(z))) -> plus(times(x,plus(y,times(s(z),|0|()))),times(x,s(z))) r2: times(x,|0|()) -> |0|() r3: times(x,s(y)) -> plus(times(x,y),x) r4: plus(x,|0|()) -> x r5: plus(x,s(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: matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: plus#_A(x1,x2) = x1 + x2 + 3 s_A(x1) = x1 + 2 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: plus#_A(x1,x2) = 0 s_A(x1) = max{4, x1 - 5} plus#!_A(x1,x2) = max{1, x1 - 1, x2 - 5} s!_A(x1) = 0 partial status: pi(plus#) = [1] pi(s) = [1] The following rules are removed: p1 Then no dependency pair remains.