YES We show the termination of the TRS R: g(x,|0|()) -> |0|() g(d(),s(x)) -> s(s(g(d(),x))) g(h(),s(|0|())) -> |0|() g(h(),s(s(x))) -> s(g(h(),x)) double(x) -> g(d(),x) half(x) -> g(h(),x) f(s(x),y) -> f(half(s(x)),double(y)) f(s(|0|()),y) -> y id(x) -> f(x,s(|0|())) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: g#(d(),s(x)) -> g#(d(),x) p2: g#(h(),s(s(x))) -> g#(h(),x) p3: double#(x) -> g#(d(),x) p4: half#(x) -> g#(h(),x) p5: f#(s(x),y) -> f#(half(s(x)),double(y)) p6: f#(s(x),y) -> half#(s(x)) p7: f#(s(x),y) -> double#(y) p8: id#(x) -> f#(x,s(|0|())) and R consists of: r1: g(x,|0|()) -> |0|() r2: g(d(),s(x)) -> s(s(g(d(),x))) r3: g(h(),s(|0|())) -> |0|() r4: g(h(),s(s(x))) -> s(g(h(),x)) r5: double(x) -> g(d(),x) r6: half(x) -> g(h(),x) r7: f(s(x),y) -> f(half(s(x)),double(y)) r8: f(s(|0|()),y) -> y r9: id(x) -> f(x,s(|0|())) The estimated dependency graph contains the following SCCs: {p5} {p1} {p2} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: f#(s(x),y) -> f#(half(s(x)),double(y)) and R consists of: r1: g(x,|0|()) -> |0|() r2: g(d(),s(x)) -> s(s(g(d(),x))) r3: g(h(),s(|0|())) -> |0|() r4: g(h(),s(s(x))) -> s(g(h(),x)) r5: double(x) -> g(d(),x) r6: half(x) -> g(h(),x) r7: f(s(x),y) -> f(half(s(x)),double(y)) r8: f(s(|0|()),y) -> y r9: id(x) -> f(x,s(|0|())) The set of usable rules consists of r1, r3, r4, r6 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: f#_A(x1,x2) = 6 s_A(x1) = 5 half_A(x1) = x1 + 3 double_A(x1) = x1 + 2 g_A(x1,x2) = x2 + 2 |0|_A() = 0 h_A() = 4 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: f#_A(x1,x2) = max{0, x1 - 1} s_A(x1) = x1 + 10 half_A(x1) = max{2, x1 - 5} double_A(x1) = x1 + 20 g_A(x1,x2) = max{0, x1 - 1, x2 - 10} |0|_A = 0 h_A = 0 f#!_A(x1,x2) = max{1, x1 - 6} s!_A(x1) = x1 + 11 half!_A(x1) = 4 double!_A(x1) = max{12, x1 - 23} g!_A(x1,x2) = max{32, x1 - 43, x2 - 21} |0|!_A = 3 h!_A = 4 partial status: pi(f#) = [] pi(s) = [] pi(half) = [] pi(double) = [] pi(g) = [2] pi(|0|) = [] pi(h) = [] 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: g#(d(),s(x)) -> g#(d(),x) and R consists of: r1: g(x,|0|()) -> |0|() r2: g(d(),s(x)) -> s(s(g(d(),x))) r3: g(h(),s(|0|())) -> |0|() r4: g(h(),s(s(x))) -> s(g(h(),x)) r5: double(x) -> g(d(),x) r6: half(x) -> g(h(),x) r7: f(s(x),y) -> f(half(s(x)),double(y)) r8: f(s(|0|()),y) -> y r9: id(x) -> f(x,s(|0|())) The set of usable rules consists of r1, r3 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: g#_A(x1,x2) = x2 + 2 d_A() = 7 s_A(x1) = x1 + 3 g_A(x1,x2) = 0 |0|_A() = 0 h_A() = 1 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: g#_A(x1,x2) = 0 d_A = 2 s_A(x1) = 7 g_A(x1,x2) = 13 |0|_A = 3 h_A = 4 g#!_A(x1,x2) = max{23, x1 + 20} d!_A = 3 s!_A(x1) = max{21, x1 + 5} g!_A(x1,x2) = max{19, x1 + 15, x2 + 10} |0|!_A = 7 h!_A = 20 partial status: pi(g#) = [2] pi(d) = [] pi(s) = [1] pi(g) = [] pi(|0|) = [] pi(h) = [] 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: g#(h(),s(s(x))) -> g#(h(),x) and R consists of: r1: g(x,|0|()) -> |0|() r2: g(d(),s(x)) -> s(s(g(d(),x))) r3: g(h(),s(|0|())) -> |0|() r4: g(h(),s(s(x))) -> s(g(h(),x)) r5: double(x) -> g(d(),x) r6: half(x) -> g(h(),x) r7: f(s(x),y) -> f(half(s(x)),double(y)) r8: f(s(|0|()),y) -> y r9: id(x) -> f(x,s(|0|())) 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: g#_A(x1,x2) = x2 + 3 h_A() = 2 s_A(x1) = x1 + 4 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: g#_A(x1,x2) = 0 h_A = 19 s_A(x1) = max{8, x1 - 9} g#!_A(x1,x2) = max{5, x2 - 34} h!_A = 2 s!_A(x1) = max{4, x1 - 24} partial status: pi(g#) = [2] pi(h) = [] pi(s) = [] The following rules are removed: p1 Then no dependency pair remains.