YES We show the termination of the TRS R: |0|(|#|()) -> |#|() +(x,|#|()) -> x +(|#|(),x) -> x +(|0|(x),|0|(y)) -> |0|(+(x,y)) +(|0|(x),|1|(y)) -> |1|(+(x,y)) +(|1|(x),|0|(y)) -> |1|(+(x,y)) +(|1|(x),|1|(y)) -> |0|(+(+(x,y),|1|(|#|()))) +(+(x,y),z) -> +(x,+(y,z)) *(|#|(),x) -> |#|() *(|0|(x),y) -> |0|(*(x,y)) *(|1|(x),y) -> +(|0|(*(x,y)),y) *(*(x,y),z) -> *(x,*(y,z)) *(x,+(y,z)) -> +(*(x,y),*(x,z)) app(nil(),l) -> l app(cons(x,l1),l2) -> cons(x,app(l1,l2)) sum(nil()) -> |0|(|#|()) sum(cons(x,l)) -> +(x,sum(l)) sum(app(l1,l2)) -> +(sum(l1),sum(l2)) prod(nil()) -> |1|(|#|()) prod(cons(x,l)) -> *(x,prod(l)) prod(app(l1,l2)) -> *(prod(l1),prod(l2)) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: +#(|0|(x),|0|(y)) -> |0|#(+(x,y)) p2: +#(|0|(x),|0|(y)) -> +#(x,y) p3: +#(|0|(x),|1|(y)) -> +#(x,y) p4: +#(|1|(x),|0|(y)) -> +#(x,y) p5: +#(|1|(x),|1|(y)) -> |0|#(+(+(x,y),|1|(|#|()))) p6: +#(|1|(x),|1|(y)) -> +#(+(x,y),|1|(|#|())) p7: +#(|1|(x),|1|(y)) -> +#(x,y) p8: +#(+(x,y),z) -> +#(x,+(y,z)) p9: +#(+(x,y),z) -> +#(y,z) p10: *#(|0|(x),y) -> |0|#(*(x,y)) p11: *#(|0|(x),y) -> *#(x,y) p12: *#(|1|(x),y) -> +#(|0|(*(x,y)),y) p13: *#(|1|(x),y) -> |0|#(*(x,y)) p14: *#(|1|(x),y) -> *#(x,y) p15: *#(*(x,y),z) -> *#(x,*(y,z)) p16: *#(*(x,y),z) -> *#(y,z) p17: *#(x,+(y,z)) -> +#(*(x,y),*(x,z)) p18: *#(x,+(y,z)) -> *#(x,y) p19: *#(x,+(y,z)) -> *#(x,z) p20: app#(cons(x,l1),l2) -> app#(l1,l2) p21: sum#(nil()) -> |0|#(|#|()) p22: sum#(cons(x,l)) -> +#(x,sum(l)) p23: sum#(cons(x,l)) -> sum#(l) p24: sum#(app(l1,l2)) -> +#(sum(l1),sum(l2)) p25: sum#(app(l1,l2)) -> sum#(l1) p26: sum#(app(l1,l2)) -> sum#(l2) p27: prod#(cons(x,l)) -> *#(x,prod(l)) p28: prod#(cons(x,l)) -> prod#(l) p29: prod#(app(l1,l2)) -> *#(prod(l1),prod(l2)) p30: prod#(app(l1,l2)) -> prod#(l1) p31: prod#(app(l1,l2)) -> prod#(l2) and R consists of: r1: |0|(|#|()) -> |#|() r2: +(x,|#|()) -> x r3: +(|#|(),x) -> x r4: +(|0|(x),|0|(y)) -> |0|(+(x,y)) r5: +(|0|(x),|1|(y)) -> |1|(+(x,y)) r6: +(|1|(x),|0|(y)) -> |1|(+(x,y)) r7: +(|1|(x),|1|(y)) -> |0|(+(+(x,y),|1|(|#|()))) r8: +(+(x,y),z) -> +(x,+(y,z)) r9: *(|#|(),x) -> |#|() r10: *(|0|(x),y) -> |0|(*(x,y)) r11: *(|1|(x),y) -> +(|0|(*(x,y)),y) r12: *(*(x,y),z) -> *(x,*(y,z)) r13: *(x,+(y,z)) -> +(*(x,y),*(x,z)) r14: app(nil(),l) -> l r15: app(cons(x,l1),l2) -> cons(x,app(l1,l2)) r16: sum(nil()) -> |0|(|#|()) r17: sum(cons(x,l)) -> +(x,sum(l)) r18: sum(app(l1,l2)) -> +(sum(l1),sum(l2)) r19: prod(nil()) -> |1|(|#|()) r20: prod(cons(x,l)) -> *(x,prod(l)) r21: prod(app(l1,l2)) -> *(prod(l1),prod(l2)) The estimated dependency graph contains the following SCCs: {p23, p25, p26} {p28, p30, p31} {p11, p14, p15, p16, p18, p19} {p2, p3, p4, p6, p7, p8, p9} {p20} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: sum#(app(l1,l2)) -> sum#(l2) p2: sum#(app(l1,l2)) -> sum#(l1) p3: sum#(cons(x,l)) -> sum#(l) and R consists of: r1: |0|(|#|()) -> |#|() r2: +(x,|#|()) -> x r3: +(|#|(),x) -> x r4: +(|0|(x),|0|(y)) -> |0|(+(x,y)) r5: +(|0|(x),|1|(y)) -> |1|(+(x,y)) r6: +(|1|(x),|0|(y)) -> |1|(+(x,y)) r7: +(|1|(x),|1|(y)) -> |0|(+(+(x,y),|1|(|#|()))) r8: +(+(x,y),z) -> +(x,+(y,z)) r9: *(|#|(),x) -> |#|() r10: *(|0|(x),y) -> |0|(*(x,y)) r11: *(|1|(x),y) -> +(|0|(*(x,y)),y) r12: *(*(x,y),z) -> *(x,*(y,z)) r13: *(x,+(y,z)) -> +(*(x,y),*(x,z)) r14: app(nil(),l) -> l r15: app(cons(x,l1),l2) -> cons(x,app(l1,l2)) r16: sum(nil()) -> |0|(|#|()) r17: sum(cons(x,l)) -> +(x,sum(l)) r18: sum(app(l1,l2)) -> +(sum(l1),sum(l2)) r19: prod(nil()) -> |1|(|#|()) r20: prod(cons(x,l)) -> *(x,prod(l)) r21: prod(app(l1,l2)) -> *(prod(l1),prod(l2)) The set of usable rules consists of (no rules) Take the reduction pair: generalized weighted path order (>=MG, >G) base order 1: max/plus interpretation on natural numbers: sum#_A(x1) = 3 app_A(x1,x2) = max{8, x1 + 2, x2 + 6} cons_A(x1,x2) = max{4, x1 - 10, x2 - 10} base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: sum#_A(x1) = x1 app_A(x1,x2) = x1 + x2 + 4 cons_A(x1,x2) = x1 + x2 + 1 sum#!_A(x1) = x1 + 20 app!_A(x1,x2) = x1 + 20 cons!_A(x1,x2) = 0 partial status: pi(sum#) = [] pi(app) = [2] pi(cons) = [] 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: prod#(app(l1,l2)) -> prod#(l2) p2: prod#(app(l1,l2)) -> prod#(l1) p3: prod#(cons(x,l)) -> prod#(l) and R consists of: r1: |0|(|#|()) -> |#|() r2: +(x,|#|()) -> x r3: +(|#|(),x) -> x r4: +(|0|(x),|0|(y)) -> |0|(+(x,y)) r5: +(|0|(x),|1|(y)) -> |1|(+(x,y)) r6: +(|1|(x),|0|(y)) -> |1|(+(x,y)) r7: +(|1|(x),|1|(y)) -> |0|(+(+(x,y),|1|(|#|()))) r8: +(+(x,y),z) -> +(x,+(y,z)) r9: *(|#|(),x) -> |#|() r10: *(|0|(x),y) -> |0|(*(x,y)) r11: *(|1|(x),y) -> +(|0|(*(x,y)),y) r12: *(*(x,y),z) -> *(x,*(y,z)) r13: *(x,+(y,z)) -> +(*(x,y),*(x,z)) r14: app(nil(),l) -> l r15: app(cons(x,l1),l2) -> cons(x,app(l1,l2)) r16: sum(nil()) -> |0|(|#|()) r17: sum(cons(x,l)) -> +(x,sum(l)) r18: sum(app(l1,l2)) -> +(sum(l1),sum(l2)) r19: prod(nil()) -> |1|(|#|()) r20: prod(cons(x,l)) -> *(x,prod(l)) r21: prod(app(l1,l2)) -> *(prod(l1),prod(l2)) The set of usable rules consists of (no rules) Take the reduction pair: generalized weighted path order (>=MG, >G) base order 1: max/plus interpretation on natural numbers: prod#_A(x1) = max{19, x1 + 15} app_A(x1,x2) = max{x1 + 16, x2 + 19} cons_A(x1,x2) = max{x1 - 17, x2 + 20} base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: prod#_A(x1) = x1 app_A(x1,x2) = x1 + x2 + 1 cons_A(x1,x2) = x1 + x2 + 1 prod#!_A(x1) = 1 app!_A(x1,x2) = x1 + 5 cons!_A(x1,x2) = 2 partial status: pi(prod#) = [1] pi(app) = [1, 2] pi(cons) = [2] 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: *#(x,+(y,z)) -> *#(x,z) p2: *#(x,+(y,z)) -> *#(x,y) p3: *#(*(x,y),z) -> *#(y,z) p4: *#(*(x,y),z) -> *#(x,*(y,z)) p5: *#(|1|(x),y) -> *#(x,y) p6: *#(|0|(x),y) -> *#(x,y) and R consists of: r1: |0|(|#|()) -> |#|() r2: +(x,|#|()) -> x r3: +(|#|(),x) -> x r4: +(|0|(x),|0|(y)) -> |0|(+(x,y)) r5: +(|0|(x),|1|(y)) -> |1|(+(x,y)) r6: +(|1|(x),|0|(y)) -> |1|(+(x,y)) r7: +(|1|(x),|1|(y)) -> |0|(+(+(x,y),|1|(|#|()))) r8: +(+(x,y),z) -> +(x,+(y,z)) r9: *(|#|(),x) -> |#|() r10: *(|0|(x),y) -> |0|(*(x,y)) r11: *(|1|(x),y) -> +(|0|(*(x,y)),y) r12: *(*(x,y),z) -> *(x,*(y,z)) r13: *(x,+(y,z)) -> +(*(x,y),*(x,z)) r14: app(nil(),l) -> l r15: app(cons(x,l1),l2) -> cons(x,app(l1,l2)) r16: sum(nil()) -> |0|(|#|()) r17: sum(cons(x,l)) -> +(x,sum(l)) r18: sum(app(l1,l2)) -> +(sum(l1),sum(l2)) r19: prod(nil()) -> |1|(|#|()) r20: prod(cons(x,l)) -> *(x,prod(l)) r21: prod(app(l1,l2)) -> *(prod(l1),prod(l2)) The set of usable rules consists of r2, r3, r9 Take the reduction pair: generalized weighted path order (>=MG, >G) base order 1: max/plus interpretation on natural numbers: *#_A(x1,x2) = 0 +_A(x1,x2) = max{11, x1 + 7, x2 + 6} *_A(x1,x2) = max{0, x1 - 11} |1|_A(x1) = 3 |0|_A(x1) = 4 |#|_A = 0 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: *#_A(x1,x2) = x1 +_A(x1,x2) = x1 + x2 + 2 *_A(x1,x2) = x1 + x2 + 4 |1|_A(x1) = x1 + 4 |0|_A(x1) = x1 + 5 |#|_A() = 7 *#!_A(x1,x2) = x1 +!_A(x1,x2) = x1 + x2 + 3 *!_A(x1,x2) = x1 + x2 + 5 |1|!_A(x1) = 11 |0|!_A(x1) = 11 |#|!_A() = 11 partial status: pi(*#) = [] pi(+) = [] pi(*) = [] pi(|1|) = [] pi(|0|) = [] pi(|#|) = [] The following rules are removed: p3, p4, p5, p6 -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: *#(x,+(y,z)) -> *#(x,z) p2: *#(x,+(y,z)) -> *#(x,y) and R consists of: r1: |0|(|#|()) -> |#|() r2: +(x,|#|()) -> x r3: +(|#|(),x) -> x r4: +(|0|(x),|0|(y)) -> |0|(+(x,y)) r5: +(|0|(x),|1|(y)) -> |1|(+(x,y)) r6: +(|1|(x),|0|(y)) -> |1|(+(x,y)) r7: +(|1|(x),|1|(y)) -> |0|(+(+(x,y),|1|(|#|()))) r8: +(+(x,y),z) -> +(x,+(y,z)) r9: *(|#|(),x) -> |#|() r10: *(|0|(x),y) -> |0|(*(x,y)) r11: *(|1|(x),y) -> +(|0|(*(x,y)),y) r12: *(*(x,y),z) -> *(x,*(y,z)) r13: *(x,+(y,z)) -> +(*(x,y),*(x,z)) r14: app(nil(),l) -> l r15: app(cons(x,l1),l2) -> cons(x,app(l1,l2)) r16: sum(nil()) -> |0|(|#|()) r17: sum(cons(x,l)) -> +(x,sum(l)) r18: sum(app(l1,l2)) -> +(sum(l1),sum(l2)) r19: prod(nil()) -> |1|(|#|()) r20: prod(cons(x,l)) -> *(x,prod(l)) r21: prod(app(l1,l2)) -> *(prod(l1),prod(l2)) The estimated dependency graph contains the following SCCs: {p1, p2} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: *#(x,+(y,z)) -> *#(x,z) p2: *#(x,+(y,z)) -> *#(x,y) and R consists of: r1: |0|(|#|()) -> |#|() r2: +(x,|#|()) -> x r3: +(|#|(),x) -> x r4: +(|0|(x),|0|(y)) -> |0|(+(x,y)) r5: +(|0|(x),|1|(y)) -> |1|(+(x,y)) r6: +(|1|(x),|0|(y)) -> |1|(+(x,y)) r7: +(|1|(x),|1|(y)) -> |0|(+(+(x,y),|1|(|#|()))) r8: +(+(x,y),z) -> +(x,+(y,z)) r9: *(|#|(),x) -> |#|() r10: *(|0|(x),y) -> |0|(*(x,y)) r11: *(|1|(x),y) -> +(|0|(*(x,y)),y) r12: *(*(x,y),z) -> *(x,*(y,z)) r13: *(x,+(y,z)) -> +(*(x,y),*(x,z)) r14: app(nil(),l) -> l r15: app(cons(x,l1),l2) -> cons(x,app(l1,l2)) r16: sum(nil()) -> |0|(|#|()) r17: sum(cons(x,l)) -> +(x,sum(l)) r18: sum(app(l1,l2)) -> +(sum(l1),sum(l2)) r19: prod(nil()) -> |1|(|#|()) r20: prod(cons(x,l)) -> *(x,prod(l)) r21: prod(app(l1,l2)) -> *(prod(l1),prod(l2)) The set of usable rules consists of r3 Take the reduction pair: generalized weighted path order (>=MG, >G) base order 1: max/plus interpretation on natural numbers: *#_A(x1,x2) = 0 +_A(x1,x2) = max{x1 - 12, x2 + 2} |#|_A = 0 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: *#_A(x1,x2) = x2 +_A(x1,x2) = x1 + x2 + 27 |#|_A() = 31 *#!_A(x1,x2) = x2 + 1 +!_A(x1,x2) = x1 + x2 |#|!_A() = 2 partial status: pi(*#) = [] pi(+) = [2] pi(|#|) = [] The following rules are removed: p1, p2 Then no dependency pair remains. -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: +#(|0|(x),|0|(y)) -> +#(x,y) p2: +#(+(x,y),z) -> +#(y,z) p3: +#(+(x,y),z) -> +#(x,+(y,z)) p4: +#(|1|(x),|1|(y)) -> +#(x,y) p5: +#(|1|(x),|1|(y)) -> +#(+(x,y),|1|(|#|())) p6: +#(|0|(x),|1|(y)) -> +#(x,y) p7: +#(|1|(x),|0|(y)) -> +#(x,y) and R consists of: r1: |0|(|#|()) -> |#|() r2: +(x,|#|()) -> x r3: +(|#|(),x) -> x r4: +(|0|(x),|0|(y)) -> |0|(+(x,y)) r5: +(|0|(x),|1|(y)) -> |1|(+(x,y)) r6: +(|1|(x),|0|(y)) -> |1|(+(x,y)) r7: +(|1|(x),|1|(y)) -> |0|(+(+(x,y),|1|(|#|()))) r8: +(+(x,y),z) -> +(x,+(y,z)) r9: *(|#|(),x) -> |#|() r10: *(|0|(x),y) -> |0|(*(x,y)) r11: *(|1|(x),y) -> +(|0|(*(x,y)),y) r12: *(*(x,y),z) -> *(x,*(y,z)) r13: *(x,+(y,z)) -> +(*(x,y),*(x,z)) r14: app(nil(),l) -> l r15: app(cons(x,l1),l2) -> cons(x,app(l1,l2)) r16: sum(nil()) -> |0|(|#|()) r17: sum(cons(x,l)) -> +(x,sum(l)) r18: sum(app(l1,l2)) -> +(sum(l1),sum(l2)) r19: prod(nil()) -> |1|(|#|()) r20: prod(cons(x,l)) -> *(x,prod(l)) r21: prod(app(l1,l2)) -> *(prod(l1),prod(l2)) The set of usable rules consists of r1, r2, r3, r4, r5, r6, r7, r8 Take the reduction pair: generalized weighted path order (>=MG, >G) base order 1: max/plus interpretation on natural numbers: +#_A(x1,x2) = max{x1 + 5, x2 + 5} |0|_A(x1) = max{7, x1} +_A(x1,x2) = max{6, x1, x2} |1|_A(x1) = max{10, x1} |#|_A = 10 base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: +#_A(x1,x2) = 0 |0|_A(x1) = x1 + 1 +_A(x1,x2) = x1 + x2 + 7 |1|_A(x1) = x1 + 12 |#|_A() = 4 +#!_A(x1,x2) = x1 + x2 + 6 |0|!_A(x1) = 8 +!_A(x1,x2) = x1 + 9 |1|!_A(x1) = 5 |#|!_A() = 3 partial status: pi(+#) = [] pi(|0|) = [] pi(+) = [1, 2] pi(|1|) = [] pi(|#|) = [] 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: +#(+(x,y),z) -> +#(x,+(y,z)) and R consists of: r1: |0|(|#|()) -> |#|() r2: +(x,|#|()) -> x r3: +(|#|(),x) -> x r4: +(|0|(x),|0|(y)) -> |0|(+(x,y)) r5: +(|0|(x),|1|(y)) -> |1|(+(x,y)) r6: +(|1|(x),|0|(y)) -> |1|(+(x,y)) r7: +(|1|(x),|1|(y)) -> |0|(+(+(x,y),|1|(|#|()))) r8: +(+(x,y),z) -> +(x,+(y,z)) r9: *(|#|(),x) -> |#|() r10: *(|0|(x),y) -> |0|(*(x,y)) r11: *(|1|(x),y) -> +(|0|(*(x,y)),y) r12: *(*(x,y),z) -> *(x,*(y,z)) r13: *(x,+(y,z)) -> +(*(x,y),*(x,z)) r14: app(nil(),l) -> l r15: app(cons(x,l1),l2) -> cons(x,app(l1,l2)) r16: sum(nil()) -> |0|(|#|()) r17: sum(cons(x,l)) -> +(x,sum(l)) r18: sum(app(l1,l2)) -> +(sum(l1),sum(l2)) r19: prod(nil()) -> |1|(|#|()) r20: prod(cons(x,l)) -> *(x,prod(l)) r21: prod(app(l1,l2)) -> *(prod(l1),prod(l2)) The estimated dependency graph contains the following SCCs: {p1} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: +#(+(x,y),z) -> +#(x,+(y,z)) and R consists of: r1: |0|(|#|()) -> |#|() r2: +(x,|#|()) -> x r3: +(|#|(),x) -> x r4: +(|0|(x),|0|(y)) -> |0|(+(x,y)) r5: +(|0|(x),|1|(y)) -> |1|(+(x,y)) r6: +(|1|(x),|0|(y)) -> |1|(+(x,y)) r7: +(|1|(x),|1|(y)) -> |0|(+(+(x,y),|1|(|#|()))) r8: +(+(x,y),z) -> +(x,+(y,z)) r9: *(|#|(),x) -> |#|() r10: *(|0|(x),y) -> |0|(*(x,y)) r11: *(|1|(x),y) -> +(|0|(*(x,y)),y) r12: *(*(x,y),z) -> *(x,*(y,z)) r13: *(x,+(y,z)) -> +(*(x,y),*(x,z)) r14: app(nil(),l) -> l r15: app(cons(x,l1),l2) -> cons(x,app(l1,l2)) r16: sum(nil()) -> |0|(|#|()) r17: sum(cons(x,l)) -> +(x,sum(l)) r18: sum(app(l1,l2)) -> +(sum(l1),sum(l2)) r19: prod(nil()) -> |1|(|#|()) r20: prod(cons(x,l)) -> *(x,prod(l)) r21: prod(app(l1,l2)) -> *(prod(l1),prod(l2)) The set of usable rules consists of (no rules) Take the reduction pair: generalized weighted path order (>=MG, >G) base order 1: max/plus interpretation on natural numbers: +#_A(x1,x2) = 0 +_A(x1,x2) = max{12, x1 - 29, x2 - 55} base order 2: marked-algebra reduction triple (>=A, >=A!, >A!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: +#_A(x1,x2) = x1 +_A(x1,x2) = x1 + x2 + 4 +#!_A(x1,x2) = x1 +!_A(x1,x2) = x1 + x2 + 5 partial status: pi(+#) = [] pi(+) = [] 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: app#(cons(x,l1),l2) -> app#(l1,l2) and R consists of: r1: |0|(|#|()) -> |#|() r2: +(x,|#|()) -> x r3: +(|#|(),x) -> x r4: +(|0|(x),|0|(y)) -> |0|(+(x,y)) r5: +(|0|(x),|1|(y)) -> |1|(+(x,y)) r6: +(|1|(x),|0|(y)) -> |1|(+(x,y)) r7: +(|1|(x),|1|(y)) -> |0|(+(+(x,y),|1|(|#|()))) r8: +(+(x,y),z) -> +(x,+(y,z)) r9: *(|#|(),x) -> |#|() r10: *(|0|(x),y) -> |0|(*(x,y)) r11: *(|1|(x),y) -> +(|0|(*(x,y)),y) r12: *(*(x,y),z) -> *(x,*(y,z)) r13: *(x,+(y,z)) -> +(*(x,y),*(x,z)) r14: app(nil(),l) -> l r15: app(cons(x,l1),l2) -> cons(x,app(l1,l2)) r16: sum(nil()) -> |0|(|#|()) r17: sum(cons(x,l)) -> +(x,sum(l)) r18: sum(app(l1,l2)) -> +(sum(l1),sum(l2)) r19: prod(nil()) -> |1|(|#|()) r20: prod(cons(x,l)) -> *(x,prod(l)) r21: prod(app(l1,l2)) -> *(prod(l1),prod(l2)) The set of usable rules consists of (no rules) Take the reduction pair: generalized weighted path order (>=MG, >G) base order 1: max/plus interpretation on natural numbers: app#_A(x1,x2) = max{7, x1 - 2} cons_A(x1,x2) = max{x1 + 1, x2 + 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: app#_A(x1,x2) = x1 cons_A(x1,x2) = x1 + x2 + 1 app#!_A(x1,x2) = x1 cons!_A(x1,x2) = x2 + 14 partial status: pi(app#) = [] pi(cons) = [2] The following rules are removed: p1 Then no dependency pair remains.