YES We show the termination of the TRS R: app(app(plus(),|0|()),y) -> y app(app(plus(),app(s(),x)),y) -> app(s(),app(app(plus(),x),y)) app(app(times(),|0|()),y) -> |0|() app(app(times(),app(s(),x)),y) -> app(app(plus(),app(app(times(),x),y)),y) app(inc(),xs) -> app(app(map(),app(plus(),app(s(),|0|()))),xs) app(double(),xs) -> app(app(map(),app(times(),app(s(),app(s(),|0|())))),xs) app(app(map(),f),nil()) -> nil() app(app(map(),f),app(app(cons(),x),xs)) -> app(app(cons(),app(f,x)),app(app(map(),f),xs)) Instead we prove termination of the uncurried system: app(cons_0(),y) -> cons_1(y) app(cons_1(x1),y) -> cons_2(x1,y) app(double_0(),y) -> double_1(y) app(inc_0(),y) -> inc_1(y) app(map_0(),y) -> map_1(y) app(map_1(x1),y) -> map_2(x1,y) app(plus_0(),y) -> plus_1(y) app(plus_1(x1),y) -> plus_2(x1,y) app(s_0(),y) -> s_1(y) app(times_0(),y) -> times_1(y) app(times_1(x1),y) -> times_2(x1,y) plus_2(|0|_0(),y) -> y plus_2(s_1(x),y) -> s_1(plus_2(x,y)) times_2(|0|_0(),y) -> |0|_0() times_2(s_1(x),y) -> plus_2(times_2(x,y),y) inc_1(xs) -> map_2(plus_1(s_1(|0|_0())),xs) double_1(xs) -> map_2(times_1(s_1(s_1(|0|_0()))),xs) map_2(f,nil_0()) -> nil_0() map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: app#(double_0(),y) -> double_1#(y) p2: app#(inc_0(),y) -> inc_1#(y) p3: app#(map_1(x1),y) -> map_2#(x1,y) p4: app#(plus_1(x1),y) -> plus_2#(x1,y) p5: app#(times_1(x1),y) -> times_2#(x1,y) p6: plus_2#(s_1(x),y) -> plus_2#(x,y) p7: times_2#(s_1(x),y) -> plus_2#(times_2(x,y),y) p8: times_2#(s_1(x),y) -> times_2#(x,y) p9: inc_1#(xs) -> map_2#(plus_1(s_1(|0|_0())),xs) p10: double_1#(xs) -> map_2#(times_1(s_1(s_1(|0|_0()))),xs) p11: map_2#(f,cons_2(x,xs)) -> app#(f,x) p12: map_2#(f,cons_2(x,xs)) -> map_2#(f,xs) and R consists of: r1: app(cons_0(),y) -> cons_1(y) r2: app(cons_1(x1),y) -> cons_2(x1,y) r3: app(double_0(),y) -> double_1(y) r4: app(inc_0(),y) -> inc_1(y) r5: app(map_0(),y) -> map_1(y) r6: app(map_1(x1),y) -> map_2(x1,y) r7: app(plus_0(),y) -> plus_1(y) r8: app(plus_1(x1),y) -> plus_2(x1,y) r9: app(s_0(),y) -> s_1(y) r10: app(times_0(),y) -> times_1(y) r11: app(times_1(x1),y) -> times_2(x1,y) r12: plus_2(|0|_0(),y) -> y r13: plus_2(s_1(x),y) -> s_1(plus_2(x,y)) r14: times_2(|0|_0(),y) -> |0|_0() r15: times_2(s_1(x),y) -> plus_2(times_2(x,y),y) r16: inc_1(xs) -> map_2(plus_1(s_1(|0|_0())),xs) r17: double_1(xs) -> map_2(times_1(s_1(s_1(|0|_0()))),xs) r18: map_2(f,nil_0()) -> nil_0() r19: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) The estimated dependency graph contains the following SCCs: {p1, p2, p3, p9, p10, p11, p12} {p8} {p6} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: app#(double_0(),y) -> double_1#(y) p2: double_1#(xs) -> map_2#(times_1(s_1(s_1(|0|_0()))),xs) p3: map_2#(f,cons_2(x,xs)) -> map_2#(f,xs) p4: map_2#(f,cons_2(x,xs)) -> app#(f,x) p5: app#(map_1(x1),y) -> map_2#(x1,y) p6: app#(inc_0(),y) -> inc_1#(y) p7: inc_1#(xs) -> map_2#(plus_1(s_1(|0|_0())),xs) and R consists of: r1: app(cons_0(),y) -> cons_1(y) r2: app(cons_1(x1),y) -> cons_2(x1,y) r3: app(double_0(),y) -> double_1(y) r4: app(inc_0(),y) -> inc_1(y) r5: app(map_0(),y) -> map_1(y) r6: app(map_1(x1),y) -> map_2(x1,y) r7: app(plus_0(),y) -> plus_1(y) r8: app(plus_1(x1),y) -> plus_2(x1,y) r9: app(s_0(),y) -> s_1(y) r10: app(times_0(),y) -> times_1(y) r11: app(times_1(x1),y) -> times_2(x1,y) r12: plus_2(|0|_0(),y) -> y r13: plus_2(s_1(x),y) -> s_1(plus_2(x,y)) r14: times_2(|0|_0(),y) -> |0|_0() r15: times_2(s_1(x),y) -> plus_2(times_2(x,y),y) r16: inc_1(xs) -> map_2(plus_1(s_1(|0|_0())),xs) r17: double_1(xs) -> map_2(times_1(s_1(s_1(|0|_0()))),xs) r18: map_2(f,nil_0()) -> nil_0() r19: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) 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: app#_A(x1,x2) = x1 + 4 double_0_A() = 13 double_1#_A(x1) = 12 map_2#_A(x1,x2) = x1 + 5 times_1_A(x1) = x1 + 4 s_1_A(x1) = 2 |0|_0_A() = 13 cons_2_A(x1,x2) = 3 map_1_A(x1) = x1 + 6 inc_0_A() = 23 inc_1#_A(x1) = 22 plus_1_A(x1) = 16 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: app#_A(x1,x2) = 0 double_0_A() = 1 double_1#_A(x1) = 0 map_2#_A(x1,x2) = 0 times_1_A(x1) = 2 s_1_A(x1) = 2 |0|_0_A() = 5 cons_2_A(x1,x2) = 4 map_1_A(x1) = 2 inc_0_A() = 1 inc_1#_A(x1) = 0 plus_1_A(x1) = 2 app#!_A(x1,x2) = 12 double_0!_A() = 0 double_1#!_A(x1) = 4 map_2#!_A(x1,x2) = 10 times_1!_A(x1) = x1 + 3 s_1!_A(x1) = 6 |0|_0!_A() = 6 cons_2!_A(x1,x2) = 9 map_1!_A(x1) = 11 inc_0!_A() = 10 inc_1#!_A(x1) = x1 + 11 plus_1!_A(x1) = 2 partial status: pi(app#) = [] pi(double_0) = [] pi(double_1#) = [] pi(map_2#) = [] pi(times_1) = [1] pi(s_1) = [] pi(|0|_0) = [] pi(cons_2) = [] pi(map_1) = [1] pi(inc_0) = [] pi(inc_1#) = [] pi(plus_1) = [] The following rules are removed: p1, p2, p4, p5, p6, p7 -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: map_2#(f,cons_2(x,xs)) -> map_2#(f,xs) and R consists of: r1: app(cons_0(),y) -> cons_1(y) r2: app(cons_1(x1),y) -> cons_2(x1,y) r3: app(double_0(),y) -> double_1(y) r4: app(inc_0(),y) -> inc_1(y) r5: app(map_0(),y) -> map_1(y) r6: app(map_1(x1),y) -> map_2(x1,y) r7: app(plus_0(),y) -> plus_1(y) r8: app(plus_1(x1),y) -> plus_2(x1,y) r9: app(s_0(),y) -> s_1(y) r10: app(times_0(),y) -> times_1(y) r11: app(times_1(x1),y) -> times_2(x1,y) r12: plus_2(|0|_0(),y) -> y r13: plus_2(s_1(x),y) -> s_1(plus_2(x,y)) r14: times_2(|0|_0(),y) -> |0|_0() r15: times_2(s_1(x),y) -> plus_2(times_2(x,y),y) r16: inc_1(xs) -> map_2(plus_1(s_1(|0|_0())),xs) r17: double_1(xs) -> map_2(times_1(s_1(s_1(|0|_0()))),xs) r18: map_2(f,nil_0()) -> nil_0() r19: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) The estimated dependency graph contains the following SCCs: {p1} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: map_2#(f,cons_2(x,xs)) -> map_2#(f,xs) and R consists of: r1: app(cons_0(),y) -> cons_1(y) r2: app(cons_1(x1),y) -> cons_2(x1,y) r3: app(double_0(),y) -> double_1(y) r4: app(inc_0(),y) -> inc_1(y) r5: app(map_0(),y) -> map_1(y) r6: app(map_1(x1),y) -> map_2(x1,y) r7: app(plus_0(),y) -> plus_1(y) r8: app(plus_1(x1),y) -> plus_2(x1,y) r9: app(s_0(),y) -> s_1(y) r10: app(times_0(),y) -> times_1(y) r11: app(times_1(x1),y) -> times_2(x1,y) r12: plus_2(|0|_0(),y) -> y r13: plus_2(s_1(x),y) -> s_1(plus_2(x,y)) r14: times_2(|0|_0(),y) -> |0|_0() r15: times_2(s_1(x),y) -> plus_2(times_2(x,y),y) r16: inc_1(xs) -> map_2(plus_1(s_1(|0|_0())),xs) r17: double_1(xs) -> map_2(times_1(s_1(s_1(|0|_0()))),xs) r18: map_2(f,nil_0()) -> nil_0() r19: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) 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: map_2#_A(x1,x2) = 1 cons_2_A(x1,x2) = 2 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: map_2#_A(x1,x2) = x2 cons_2_A(x1,x2) = x2 + 2 map_2#!_A(x1,x2) = x2 cons_2!_A(x1,x2) = 7 partial status: pi(map_2#) = [] pi(cons_2) = [] 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: times_2#(s_1(x),y) -> times_2#(x,y) and R consists of: r1: app(cons_0(),y) -> cons_1(y) r2: app(cons_1(x1),y) -> cons_2(x1,y) r3: app(double_0(),y) -> double_1(y) r4: app(inc_0(),y) -> inc_1(y) r5: app(map_0(),y) -> map_1(y) r6: app(map_1(x1),y) -> map_2(x1,y) r7: app(plus_0(),y) -> plus_1(y) r8: app(plus_1(x1),y) -> plus_2(x1,y) r9: app(s_0(),y) -> s_1(y) r10: app(times_0(),y) -> times_1(y) r11: app(times_1(x1),y) -> times_2(x1,y) r12: plus_2(|0|_0(),y) -> y r13: plus_2(s_1(x),y) -> s_1(plus_2(x,y)) r14: times_2(|0|_0(),y) -> |0|_0() r15: times_2(s_1(x),y) -> plus_2(times_2(x,y),y) r16: inc_1(xs) -> map_2(plus_1(s_1(|0|_0())),xs) r17: double_1(xs) -> map_2(times_1(s_1(s_1(|0|_0()))),xs) r18: map_2(f,nil_0()) -> nil_0() r19: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) 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: times_2#_A(x1,x2) = x1 s_1_A(x1) = x1 + 15 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: times_2#_A(x1,x2) = x1 s_1_A(x1) = x1 + 2 times_2#!_A(x1,x2) = x1 + 5 s_1!_A(x1) = 4 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_2#(s_1(x),y) -> plus_2#(x,y) and R consists of: r1: app(cons_0(),y) -> cons_1(y) r2: app(cons_1(x1),y) -> cons_2(x1,y) r3: app(double_0(),y) -> double_1(y) r4: app(inc_0(),y) -> inc_1(y) r5: app(map_0(),y) -> map_1(y) r6: app(map_1(x1),y) -> map_2(x1,y) r7: app(plus_0(),y) -> plus_1(y) r8: app(plus_1(x1),y) -> plus_2(x1,y) r9: app(s_0(),y) -> s_1(y) r10: app(times_0(),y) -> times_1(y) r11: app(times_1(x1),y) -> times_2(x1,y) r12: plus_2(|0|_0(),y) -> y r13: plus_2(s_1(x),y) -> s_1(plus_2(x,y)) r14: times_2(|0|_0(),y) -> |0|_0() r15: times_2(s_1(x),y) -> plus_2(times_2(x,y),y) r16: inc_1(xs) -> map_2(plus_1(s_1(|0|_0())),xs) r17: double_1(xs) -> map_2(times_1(s_1(s_1(|0|_0()))),xs) r18: map_2(f,nil_0()) -> nil_0() r19: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) 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_2#_A(x1,x2) = x1 s_1_A(x1) = x1 + 7 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: plus_2#_A(x1,x2) = x1 s_1_A(x1) = x1 + 2 plus_2#!_A(x1,x2) = x1 + 3 s_1!_A(x1) = 2 partial status: pi(plus_2#) = [] pi(s_1) = [] The following rules are removed: p1 Then no dependency pair remains.