YES We show the termination of the TRS R: app(app(times(),x),app(app(plus(),y),app(s(),z))) -> app(app(plus(),app(app(times(),x),app(app(plus(),y),app(app(times(),app(s(),z)),|0|())))),app(app(times(),x),app(s(),z))) app(app(times(),x),|0|()) -> |0|() app(app(times(),x),app(s(),y)) -> app(app(plus(),app(app(times(),x),y)),x) app(app(plus(),x),|0|()) -> x app(app(plus(),x),app(s(),y)) -> app(s(),app(app(plus(),x),y)) 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)) app(app(filter(),f),nil()) -> nil() app(app(filter(),f),app(app(cons(),x),xs)) -> app(app(app(app(filter2(),app(f,x)),f),x),xs) app(app(app(app(filter2(),true()),f),x),xs) -> app(app(cons(),x),app(app(filter(),f),xs)) app(app(app(app(filter2(),false()),f),x),xs) -> app(app(filter(),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(filter_0(),y) -> filter_1(y) app(filter_1(x1),y) -> filter_2(x1,y) app(filter2_0(),y) -> filter2_1(y) app(filter2_1(x1),y) -> filter2_2(x1,y) app(filter2_2(x1,x2),y) -> filter2_3(x1,x2,y) app(filter2_3(x1,x2,x3),y) -> filter2_4(x1,x2,x3,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) times_2(x,plus_2(y,s_1(z))) -> plus_2(times_2(x,plus_2(y,times_2(s_1(z),|0|_0()))),times_2(x,s_1(z))) times_2(x,|0|_0()) -> |0|_0() times_2(x,s_1(y)) -> plus_2(times_2(x,y),x) plus_2(x,|0|_0()) -> x plus_2(x,s_1(y)) -> s_1(plus_2(x,y)) map_2(f,nil_0()) -> nil_0() map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) filter_2(f,nil_0()) -> nil_0() filter_2(f,cons_2(x,xs)) -> filter2_4(app(f,x),f,x,xs) filter2_4(true_0(),f,x,xs) -> cons_2(x,filter_2(f,xs)) filter2_4(false_0(),f,x,xs) -> filter_2(f,xs) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: app#(filter_1(x1),y) -> filter_2#(x1,y) p2: app#(filter2_3(x1,x2,x3),y) -> filter2_4#(x1,x2,x3,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: times_2#(x,plus_2(y,s_1(z))) -> plus_2#(times_2(x,plus_2(y,times_2(s_1(z),|0|_0()))),times_2(x,s_1(z))) p7: times_2#(x,plus_2(y,s_1(z))) -> times_2#(x,plus_2(y,times_2(s_1(z),|0|_0()))) p8: times_2#(x,plus_2(y,s_1(z))) -> plus_2#(y,times_2(s_1(z),|0|_0())) p9: times_2#(x,plus_2(y,s_1(z))) -> times_2#(s_1(z),|0|_0()) p10: times_2#(x,plus_2(y,s_1(z))) -> times_2#(x,s_1(z)) p11: times_2#(x,s_1(y)) -> plus_2#(times_2(x,y),x) p12: times_2#(x,s_1(y)) -> times_2#(x,y) p13: plus_2#(x,s_1(y)) -> plus_2#(x,y) p14: map_2#(f,cons_2(x,xs)) -> app#(f,x) p15: map_2#(f,cons_2(x,xs)) -> map_2#(f,xs) p16: filter_2#(f,cons_2(x,xs)) -> filter2_4#(app(f,x),f,x,xs) p17: filter_2#(f,cons_2(x,xs)) -> app#(f,x) p18: filter2_4#(true_0(),f,x,xs) -> filter_2#(f,xs) p19: filter2_4#(false_0(),f,x,xs) -> filter_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(filter_0(),y) -> filter_1(y) r4: app(filter_1(x1),y) -> filter_2(x1,y) r5: app(filter2_0(),y) -> filter2_1(y) r6: app(filter2_1(x1),y) -> filter2_2(x1,y) r7: app(filter2_2(x1,x2),y) -> filter2_3(x1,x2,y) r8: app(filter2_3(x1,x2,x3),y) -> filter2_4(x1,x2,x3,y) r9: app(map_0(),y) -> map_1(y) r10: app(map_1(x1),y) -> map_2(x1,y) r11: app(plus_0(),y) -> plus_1(y) r12: app(plus_1(x1),y) -> plus_2(x1,y) r13: app(s_0(),y) -> s_1(y) r14: app(times_0(),y) -> times_1(y) r15: app(times_1(x1),y) -> times_2(x1,y) r16: times_2(x,plus_2(y,s_1(z))) -> plus_2(times_2(x,plus_2(y,times_2(s_1(z),|0|_0()))),times_2(x,s_1(z))) r17: times_2(x,|0|_0()) -> |0|_0() r18: times_2(x,s_1(y)) -> plus_2(times_2(x,y),x) r19: plus_2(x,|0|_0()) -> x r20: plus_2(x,s_1(y)) -> s_1(plus_2(x,y)) r21: map_2(f,nil_0()) -> nil_0() r22: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r23: filter_2(f,nil_0()) -> nil_0() r24: filter_2(f,cons_2(x,xs)) -> filter2_4(app(f,x),f,x,xs) r25: filter2_4(true_0(),f,x,xs) -> cons_2(x,filter_2(f,xs)) r26: filter2_4(false_0(),f,x,xs) -> filter_2(f,xs) The estimated dependency graph contains the following SCCs: {p1, p2, p3, p14, p15, p16, p17, p18, p19} {p7, p10, p12} {p13} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: app#(filter_1(x1),y) -> filter_2#(x1,y) p2: filter_2#(f,cons_2(x,xs)) -> app#(f,x) p3: app#(map_1(x1),y) -> map_2#(x1,y) p4: map_2#(f,cons_2(x,xs)) -> map_2#(f,xs) p5: map_2#(f,cons_2(x,xs)) -> app#(f,x) p6: app#(filter2_3(x1,x2,x3),y) -> filter2_4#(x1,x2,x3,y) p7: filter2_4#(false_0(),f,x,xs) -> filter_2#(f,xs) p8: filter_2#(f,cons_2(x,xs)) -> filter2_4#(app(f,x),f,x,xs) p9: filter2_4#(true_0(),f,x,xs) -> filter_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(filter_0(),y) -> filter_1(y) r4: app(filter_1(x1),y) -> filter_2(x1,y) r5: app(filter2_0(),y) -> filter2_1(y) r6: app(filter2_1(x1),y) -> filter2_2(x1,y) r7: app(filter2_2(x1,x2),y) -> filter2_3(x1,x2,y) r8: app(filter2_3(x1,x2,x3),y) -> filter2_4(x1,x2,x3,y) r9: app(map_0(),y) -> map_1(y) r10: app(map_1(x1),y) -> map_2(x1,y) r11: app(plus_0(),y) -> plus_1(y) r12: app(plus_1(x1),y) -> plus_2(x1,y) r13: app(s_0(),y) -> s_1(y) r14: app(times_0(),y) -> times_1(y) r15: app(times_1(x1),y) -> times_2(x1,y) r16: times_2(x,plus_2(y,s_1(z))) -> plus_2(times_2(x,plus_2(y,times_2(s_1(z),|0|_0()))),times_2(x,s_1(z))) r17: times_2(x,|0|_0()) -> |0|_0() r18: times_2(x,s_1(y)) -> plus_2(times_2(x,y),x) r19: plus_2(x,|0|_0()) -> x r20: plus_2(x,s_1(y)) -> s_1(plus_2(x,y)) r21: map_2(f,nil_0()) -> nil_0() r22: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r23: filter_2(f,nil_0()) -> nil_0() r24: filter_2(f,cons_2(x,xs)) -> filter2_4(app(f,x),f,x,xs) r25: filter2_4(true_0(),f,x,xs) -> cons_2(x,filter_2(f,xs)) r26: filter2_4(false_0(),f,x,xs) -> filter_2(f,xs) The set of usable rules consists of r6, r11, r13, r21, r23 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!): max/plus interpretation on natural numbers: app#_A(x1,x2) = max{1, x1 - 61, x2 - 74} filter_1_A(x1) = max{2, x1 + 1} filter_2#_A(x1,x2) = max{1, x1 - 60, x2 - 74} cons_2_A(x1,x2) = max{4, x1, x2} map_1_A(x1) = max{60, x1 + 20} map_2#_A(x1,x2) = max{1, x1 - 61, x2 - 74} filter2_3_A(x1,x2,x3) = x2 + 2 filter2_4#_A(x1,x2,x3,x4) = max{1, x2 - 60, x4 - 74} false_0_A = 13 app_A(x1,x2) = max{13, x1 - 61, x2 - 61} true_0_A = 13 filter2_1_A(x1) = x1 + 60 filter2_2_A(x1,x2) = max{0, x1 - 1, x2 - 61} plus_0_A = 0 plus_1_A(x1) = max{0, x1 - 61} s_0_A = 60 s_1_A(x1) = max{13, x1 - 98} map_2_A(x1,x2) = max{13, x1 - 40, x2 - 3} nil_0_A = 1 filter_2_A(x1,x2) = 4 app#!_A(x1,x2) = max{0, x1 - 21} filter_1!_A(x1) = 51 filter_2#!_A(x1,x2) = max{0, x1 - 20} cons_2!_A(x1,x2) = x2 map_1!_A(x1) = 2 map_2#!_A(x1,x2) = max{3, x1 - 20} filter2_3!_A(x1,x2,x3) = max{57, x1 - 14, x2 - 2, x3 - 1} filter2_4#!_A(x1,x2,x3,x4) = max{0, x2 - 20} false_0!_A = 1 app!_A(x1,x2) = max{50, x1 - 3, x2} true_0!_A = 5 filter2_1!_A(x1) = max{56, x1 - 15} filter2_2!_A(x1,x2) = max{56, x1 - 15} plus_0!_A = 1 plus_1!_A(x1) = max{2, x1 - 1} s_0!_A = 1 s_1!_A(x1) = 56 map_2!_A(x1,x2) = max{16, x1 + 14, x2 - 2} nil_0!_A = 15 filter_2!_A(x1,x2) = max{52, x2 - 76} 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) = x1 filter_1_A(x1) = x1 + 5 filter_2#_A(x1,x2) = x1 + 5 cons_2_A(x1,x2) = 1 map_1_A(x1) = x1 + 3 map_2#_A(x1,x2) = x1 filter2_3_A(x1,x2,x3) = x1 + x2 + x3 + 7 filter2_4#_A(x1,x2,x3,x4) = x2 + 5 false_0_A() = 1 app_A(x1,x2) = x1 + x2 + 1 true_0_A() = 1 filter2_1_A(x1) = x1 + 5 filter2_2_A(x1,x2) = x1 + x2 + 6 plus_0_A() = 1 plus_1_A(x1) = x1 + 1 s_0_A() = 7 s_1_A(x1) = x1 + 3 map_2_A(x1,x2) = x1 + x2 + 1 nil_0_A() = 1 filter_2_A(x1,x2) = 1 app#!_A(x1,x2) = x1 + 2 filter_1!_A(x1) = 7 filter_2#!_A(x1,x2) = x1 + 6 cons_2!_A(x1,x2) = x2 + 3 map_1!_A(x1) = 0 map_2#!_A(x1,x2) = 4 filter2_3!_A(x1,x2,x3) = 7 filter2_4#!_A(x1,x2,x3,x4) = x2 + 6 false_0!_A() = 9 app!_A(x1,x2) = x1 + x2 + 2 true_0!_A() = 5 filter2_1!_A(x1) = x1 + 7 filter2_2!_A(x1,x2) = 0 plus_0!_A() = 1 plus_1!_A(x1) = 0 s_0!_A() = 0 s_1!_A(x1) = x1 + 8 map_2!_A(x1,x2) = 1 nil_0!_A() = 0 filter_2!_A(x1,x2) = 8 partial status: pi(app#) = [] pi(filter_1) = [1] pi(filter_2#) = [] pi(cons_2) = [] pi(map_1) = [] pi(map_2#) = [] pi(filter2_3) = [2, 3] pi(filter2_4#) = [] pi(false_0) = [] pi(app) = [1, 2] pi(true_0) = [] pi(filter2_1) = [1] pi(filter2_2) = [] pi(plus_0) = [] pi(plus_1) = [] pi(s_0) = [] pi(s_1) = [1] pi(map_2) = [2] pi(nil_0) = [] pi(filter_2) = [1] The following rules are removed: p1, p2, p3, p5, p6 -- 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) p2: filter2_4#(false_0(),f,x,xs) -> filter_2#(f,xs) p3: filter_2#(f,cons_2(x,xs)) -> filter2_4#(app(f,x),f,x,xs) p4: filter2_4#(true_0(),f,x,xs) -> filter_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(filter_0(),y) -> filter_1(y) r4: app(filter_1(x1),y) -> filter_2(x1,y) r5: app(filter2_0(),y) -> filter2_1(y) r6: app(filter2_1(x1),y) -> filter2_2(x1,y) r7: app(filter2_2(x1,x2),y) -> filter2_3(x1,x2,y) r8: app(filter2_3(x1,x2,x3),y) -> filter2_4(x1,x2,x3,y) r9: app(map_0(),y) -> map_1(y) r10: app(map_1(x1),y) -> map_2(x1,y) r11: app(plus_0(),y) -> plus_1(y) r12: app(plus_1(x1),y) -> plus_2(x1,y) r13: app(s_0(),y) -> s_1(y) r14: app(times_0(),y) -> times_1(y) r15: app(times_1(x1),y) -> times_2(x1,y) r16: times_2(x,plus_2(y,s_1(z))) -> plus_2(times_2(x,plus_2(y,times_2(s_1(z),|0|_0()))),times_2(x,s_1(z))) r17: times_2(x,|0|_0()) -> |0|_0() r18: times_2(x,s_1(y)) -> plus_2(times_2(x,y),x) r19: plus_2(x,|0|_0()) -> x r20: plus_2(x,s_1(y)) -> s_1(plus_2(x,y)) r21: map_2(f,nil_0()) -> nil_0() r22: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r23: filter_2(f,nil_0()) -> nil_0() r24: filter_2(f,cons_2(x,xs)) -> filter2_4(app(f,x),f,x,xs) r25: filter2_4(true_0(),f,x,xs) -> cons_2(x,filter_2(f,xs)) r26: filter2_4(false_0(),f,x,xs) -> filter_2(f,xs) The estimated dependency graph contains the following SCCs: {p1} {p2, p3, p4} -- 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(filter_0(),y) -> filter_1(y) r4: app(filter_1(x1),y) -> filter_2(x1,y) r5: app(filter2_0(),y) -> filter2_1(y) r6: app(filter2_1(x1),y) -> filter2_2(x1,y) r7: app(filter2_2(x1,x2),y) -> filter2_3(x1,x2,y) r8: app(filter2_3(x1,x2,x3),y) -> filter2_4(x1,x2,x3,y) r9: app(map_0(),y) -> map_1(y) r10: app(map_1(x1),y) -> map_2(x1,y) r11: app(plus_0(),y) -> plus_1(y) r12: app(plus_1(x1),y) -> plus_2(x1,y) r13: app(s_0(),y) -> s_1(y) r14: app(times_0(),y) -> times_1(y) r15: app(times_1(x1),y) -> times_2(x1,y) r16: times_2(x,plus_2(y,s_1(z))) -> plus_2(times_2(x,plus_2(y,times_2(s_1(z),|0|_0()))),times_2(x,s_1(z))) r17: times_2(x,|0|_0()) -> |0|_0() r18: times_2(x,s_1(y)) -> plus_2(times_2(x,y),x) r19: plus_2(x,|0|_0()) -> x r20: plus_2(x,s_1(y)) -> s_1(plus_2(x,y)) r21: map_2(f,nil_0()) -> nil_0() r22: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r23: filter_2(f,nil_0()) -> nil_0() r24: filter_2(f,cons_2(x,xs)) -> filter2_4(app(f,x),f,x,xs) r25: filter2_4(true_0(),f,x,xs) -> cons_2(x,filter_2(f,xs)) r26: filter2_4(false_0(),f,x,xs) -> filter_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: 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!): max/plus interpretation on natural numbers: map_2#_A(x1,x2) = 0 cons_2_A(x1,x2) = max{2, x1 - 19, x2 - 19} map_2#!_A(x1,x2) = max{0, x1 - 1} cons_2!_A(x1,x2) = max{x1 + 28, x2 + 17} 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 + 5 map_2#!_A(x1,x2) = x2 + 13 cons_2!_A(x1,x2) = 12 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: filter2_4#(false_0(),f,x,xs) -> filter_2#(f,xs) p2: filter_2#(f,cons_2(x,xs)) -> filter2_4#(app(f,x),f,x,xs) p3: filter2_4#(true_0(),f,x,xs) -> filter_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(filter_0(),y) -> filter_1(y) r4: app(filter_1(x1),y) -> filter_2(x1,y) r5: app(filter2_0(),y) -> filter2_1(y) r6: app(filter2_1(x1),y) -> filter2_2(x1,y) r7: app(filter2_2(x1,x2),y) -> filter2_3(x1,x2,y) r8: app(filter2_3(x1,x2,x3),y) -> filter2_4(x1,x2,x3,y) r9: app(map_0(),y) -> map_1(y) r10: app(map_1(x1),y) -> map_2(x1,y) r11: app(plus_0(),y) -> plus_1(y) r12: app(plus_1(x1),y) -> plus_2(x1,y) r13: app(s_0(),y) -> s_1(y) r14: app(times_0(),y) -> times_1(y) r15: app(times_1(x1),y) -> times_2(x1,y) r16: times_2(x,plus_2(y,s_1(z))) -> plus_2(times_2(x,plus_2(y,times_2(s_1(z),|0|_0()))),times_2(x,s_1(z))) r17: times_2(x,|0|_0()) -> |0|_0() r18: times_2(x,s_1(y)) -> plus_2(times_2(x,y),x) r19: plus_2(x,|0|_0()) -> x r20: plus_2(x,s_1(y)) -> s_1(plus_2(x,y)) r21: map_2(f,nil_0()) -> nil_0() r22: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r23: filter_2(f,nil_0()) -> nil_0() r24: filter_2(f,cons_2(x,xs)) -> filter2_4(app(f,x),f,x,xs) r25: filter2_4(true_0(),f,x,xs) -> cons_2(x,filter_2(f,xs)) r26: filter2_4(false_0(),f,x,xs) -> filter_2(f,xs) The set of usable rules consists of r23 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!): max/plus interpretation on natural numbers: filter2_4#_A(x1,x2,x3,x4) = max{1, x2 - 1, x3 - 92, x4 - 13} false_0_A = 102 filter_2#_A(x1,x2) = max{1, x1 - 1, x2 - 22} cons_2_A(x1,x2) = max{21, x1 - 70, x2 + 9} app_A(x1,x2) = max{34, x1 - 139} true_0_A = 102 filter_2_A(x1,x2) = max{11, x1 - 243, x2} nil_0_A = 12 filter2_4#!_A(x1,x2,x3,x4) = max{92, x2 + 84, x3 - 1, x4 + 82} false_0!_A = 1 filter_2#!_A(x1,x2) = max{x1 + 84, x2 + 82} cons_2!_A(x1,x2) = max{x1 + 14, x2 + 7} app!_A(x1,x2) = max{x1 - 35, x2 + 12} true_0!_A = 4 filter_2!_A(x1,x2) = max{5, x2 - 13} nil_0!_A = 4 2. marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: filter2_4#_A(x1,x2,x3,x4) = x4 false_0_A() = 1 filter_2#_A(x1,x2) = x2 cons_2_A(x1,x2) = x2 + 6 app_A(x1,x2) = x1 + x2 true_0_A() = 1 filter_2_A(x1,x2) = x1 + x2 + 6 nil_0_A() = 1 filter2_4#!_A(x1,x2,x3,x4) = x4 + 6 false_0!_A() = 2 filter_2#!_A(x1,x2) = x2 + 1 cons_2!_A(x1,x2) = x1 + x2 + 5 app!_A(x1,x2) = x1 + 10 true_0!_A() = 0 filter_2!_A(x1,x2) = x2 + 3 nil_0!_A() = 0 partial status: pi(filter2_4#) = [2] pi(false_0) = [] pi(filter_2#) = [1] pi(cons_2) = [1, 2] pi(app) = [1, 2] pi(true_0) = [] pi(filter_2) = [2] pi(nil_0) = [] The following rules are removed: p1, p2, p3 Then no dependency pair remains. -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: times_2#(x,s_1(y)) -> times_2#(x,y) p2: times_2#(x,plus_2(y,s_1(z))) -> times_2#(x,s_1(z)) p3: times_2#(x,plus_2(y,s_1(z))) -> times_2#(x,plus_2(y,times_2(s_1(z),|0|_0()))) and R consists of: r1: app(cons_0(),y) -> cons_1(y) r2: app(cons_1(x1),y) -> cons_2(x1,y) r3: app(filter_0(),y) -> filter_1(y) r4: app(filter_1(x1),y) -> filter_2(x1,y) r5: app(filter2_0(),y) -> filter2_1(y) r6: app(filter2_1(x1),y) -> filter2_2(x1,y) r7: app(filter2_2(x1,x2),y) -> filter2_3(x1,x2,y) r8: app(filter2_3(x1,x2,x3),y) -> filter2_4(x1,x2,x3,y) r9: app(map_0(),y) -> map_1(y) r10: app(map_1(x1),y) -> map_2(x1,y) r11: app(plus_0(),y) -> plus_1(y) r12: app(plus_1(x1),y) -> plus_2(x1,y) r13: app(s_0(),y) -> s_1(y) r14: app(times_0(),y) -> times_1(y) r15: app(times_1(x1),y) -> times_2(x1,y) r16: times_2(x,plus_2(y,s_1(z))) -> plus_2(times_2(x,plus_2(y,times_2(s_1(z),|0|_0()))),times_2(x,s_1(z))) r17: times_2(x,|0|_0()) -> |0|_0() r18: times_2(x,s_1(y)) -> plus_2(times_2(x,y),x) r19: plus_2(x,|0|_0()) -> x r20: plus_2(x,s_1(y)) -> s_1(plus_2(x,y)) r21: map_2(f,nil_0()) -> nil_0() r22: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r23: filter_2(f,nil_0()) -> nil_0() r24: filter_2(f,cons_2(x,xs)) -> filter2_4(app(f,x),f,x,xs) r25: filter2_4(true_0(),f,x,xs) -> cons_2(x,filter_2(f,xs)) r26: filter2_4(false_0(),f,x,xs) -> filter_2(f,xs) The set of usable rules consists of r17, r19, r20 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!): max/plus interpretation on natural numbers: times_2#_A(x1,x2) = 0 s_1_A(x1) = x1 plus_2_A(x1,x2) = x1 + 27 times_2_A(x1,x2) = max{x1 + 25, x2 - 27} |0|_0_A = 25 times_2#!_A(x1,x2) = 19 s_1!_A(x1) = 17 plus_2!_A(x1,x2) = max{19, x2 - 5} times_2!_A(x1,x2) = x1 + 52 |0|_0!_A = 18 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) = x2 s_1_A(x1) = x1 + 5 plus_2_A(x1,x2) = x1 + x2 + 3 times_2_A(x1,x2) = x1 |0|_0_A() = 0 times_2#!_A(x1,x2) = x2 s_1!_A(x1) = 6 plus_2!_A(x1,x2) = x2 + 13 times_2!_A(x1,x2) = x2 + 9 |0|_0!_A() = 7 partial status: pi(times_2#) = [] pi(s_1) = [1] pi(plus_2) = [1] pi(times_2) = [] pi(|0|_0) = [] The following rules are removed: p1, p2 -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: times_2#(x,plus_2(y,s_1(z))) -> times_2#(x,plus_2(y,times_2(s_1(z),|0|_0()))) and R consists of: r1: app(cons_0(),y) -> cons_1(y) r2: app(cons_1(x1),y) -> cons_2(x1,y) r3: app(filter_0(),y) -> filter_1(y) r4: app(filter_1(x1),y) -> filter_2(x1,y) r5: app(filter2_0(),y) -> filter2_1(y) r6: app(filter2_1(x1),y) -> filter2_2(x1,y) r7: app(filter2_2(x1,x2),y) -> filter2_3(x1,x2,y) r8: app(filter2_3(x1,x2,x3),y) -> filter2_4(x1,x2,x3,y) r9: app(map_0(),y) -> map_1(y) r10: app(map_1(x1),y) -> map_2(x1,y) r11: app(plus_0(),y) -> plus_1(y) r12: app(plus_1(x1),y) -> plus_2(x1,y) r13: app(s_0(),y) -> s_1(y) r14: app(times_0(),y) -> times_1(y) r15: app(times_1(x1),y) -> times_2(x1,y) r16: times_2(x,plus_2(y,s_1(z))) -> plus_2(times_2(x,plus_2(y,times_2(s_1(z),|0|_0()))),times_2(x,s_1(z))) r17: times_2(x,|0|_0()) -> |0|_0() r18: times_2(x,s_1(y)) -> plus_2(times_2(x,y),x) r19: plus_2(x,|0|_0()) -> x r20: plus_2(x,s_1(y)) -> s_1(plus_2(x,y)) r21: map_2(f,nil_0()) -> nil_0() r22: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r23: filter_2(f,nil_0()) -> nil_0() r24: filter_2(f,cons_2(x,xs)) -> filter2_4(app(f,x),f,x,xs) r25: filter2_4(true_0(),f,x,xs) -> cons_2(x,filter_2(f,xs)) r26: filter2_4(false_0(),f,x,xs) -> filter_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: times_2#(x,plus_2(y,s_1(z))) -> times_2#(x,plus_2(y,times_2(s_1(z),|0|_0()))) and R consists of: r1: app(cons_0(),y) -> cons_1(y) r2: app(cons_1(x1),y) -> cons_2(x1,y) r3: app(filter_0(),y) -> filter_1(y) r4: app(filter_1(x1),y) -> filter_2(x1,y) r5: app(filter2_0(),y) -> filter2_1(y) r6: app(filter2_1(x1),y) -> filter2_2(x1,y) r7: app(filter2_2(x1,x2),y) -> filter2_3(x1,x2,y) r8: app(filter2_3(x1,x2,x3),y) -> filter2_4(x1,x2,x3,y) r9: app(map_0(),y) -> map_1(y) r10: app(map_1(x1),y) -> map_2(x1,y) r11: app(plus_0(),y) -> plus_1(y) r12: app(plus_1(x1),y) -> plus_2(x1,y) r13: app(s_0(),y) -> s_1(y) r14: app(times_0(),y) -> times_1(y) r15: app(times_1(x1),y) -> times_2(x1,y) r16: times_2(x,plus_2(y,s_1(z))) -> plus_2(times_2(x,plus_2(y,times_2(s_1(z),|0|_0()))),times_2(x,s_1(z))) r17: times_2(x,|0|_0()) -> |0|_0() r18: times_2(x,s_1(y)) -> plus_2(times_2(x,y),x) r19: plus_2(x,|0|_0()) -> x r20: plus_2(x,s_1(y)) -> s_1(plus_2(x,y)) r21: map_2(f,nil_0()) -> nil_0() r22: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r23: filter_2(f,nil_0()) -> nil_0() r24: filter_2(f,cons_2(x,xs)) -> filter2_4(app(f,x),f,x,xs) r25: filter2_4(true_0(),f,x,xs) -> cons_2(x,filter_2(f,xs)) r26: filter2_4(false_0(),f,x,xs) -> filter_2(f,xs) The set of usable rules consists of r17, r19, r20 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!): max/plus interpretation on natural numbers: times_2#_A(x1,x2) = max{59, x1 - 4, x2} plus_2_A(x1,x2) = max{x1, x2} s_1_A(x1) = 3 times_2_A(x1,x2) = max{x1 - 6, x2 + 30} |0|_0_A = 29 times_2#!_A(x1,x2) = x1 + 74 plus_2!_A(x1,x2) = max{x1 - 24, x2 + 13} s_1!_A(x1) = 2 times_2!_A(x1,x2) = max{x1 + 4, x2 - 12} |0|_0!_A = 2 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) = x2 plus_2_A(x1,x2) = x1 + x2 + 5 s_1_A(x1) = x1 + 3 times_2_A(x1,x2) = 0 |0|_0_A() = 0 times_2#!_A(x1,x2) = x2 plus_2!_A(x1,x2) = x2 + 7 s_1!_A(x1) = 6 times_2!_A(x1,x2) = 11 |0|_0!_A() = 0 partial status: pi(times_2#) = [1] pi(plus_2) = [1, 2] pi(s_1) = [] pi(times_2) = [1] pi(|0|_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_2#(x,s_1(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(filter_0(),y) -> filter_1(y) r4: app(filter_1(x1),y) -> filter_2(x1,y) r5: app(filter2_0(),y) -> filter2_1(y) r6: app(filter2_1(x1),y) -> filter2_2(x1,y) r7: app(filter2_2(x1,x2),y) -> filter2_3(x1,x2,y) r8: app(filter2_3(x1,x2,x3),y) -> filter2_4(x1,x2,x3,y) r9: app(map_0(),y) -> map_1(y) r10: app(map_1(x1),y) -> map_2(x1,y) r11: app(plus_0(),y) -> plus_1(y) r12: app(plus_1(x1),y) -> plus_2(x1,y) r13: app(s_0(),y) -> s_1(y) r14: app(times_0(),y) -> times_1(y) r15: app(times_1(x1),y) -> times_2(x1,y) r16: times_2(x,plus_2(y,s_1(z))) -> plus_2(times_2(x,plus_2(y,times_2(s_1(z),|0|_0()))),times_2(x,s_1(z))) r17: times_2(x,|0|_0()) -> |0|_0() r18: times_2(x,s_1(y)) -> plus_2(times_2(x,y),x) r19: plus_2(x,|0|_0()) -> x r20: plus_2(x,s_1(y)) -> s_1(plus_2(x,y)) r21: map_2(f,nil_0()) -> nil_0() r22: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r23: filter_2(f,nil_0()) -> nil_0() r24: filter_2(f,cons_2(x,xs)) -> filter2_4(app(f,x),f,x,xs) r25: filter2_4(true_0(),f,x,xs) -> cons_2(x,filter_2(f,xs)) r26: filter2_4(false_0(),f,x,xs) -> filter_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: 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!): max/plus interpretation on natural numbers: plus_2#_A(x1,x2) = 0 s_1_A(x1) = max{26, x1 + 11} plus_2#!_A(x1,x2) = max{1, x2 - 24} s_1!_A(x1) = max{146, x1 - 87} 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) = 0 s_1_A(x1) = 9 plus_2#!_A(x1,x2) = 0 s_1!_A(x1) = 5 partial status: pi(plus_2#) = [] pi(s_1) = [1] The following rules are removed: p1 Then no dependency pair remains.