YES We show the termination of the TRS R: 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(minus(),x),|0|()) -> x app(app(minus(),app(s(),x)),app(s(),y)) -> app(app(minus(),app(p(),app(s(),x))),app(p(),app(s(),y))) app(p(),app(s(),x)) -> x app(app(div(),|0|()),app(s(),y)) -> |0|() app(app(div(),app(s(),x)),app(s(),y)) -> app(s(),app(app(div(),app(app(minus(),x),app(id(),y))),app(s(),y))) app(id(),x) -> x app(id(),x) -> app(s(),app(s(),app(s(),x))) app(id(),app(p(),x)) -> app(id(),app(s(),app(id(),x))) 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(div_0(),y) -> div_1(y) app(div_1(x1),y) -> div_2(x1,y) app(id_0(),y) -> id_1(y) app(map_0(),y) -> map_1(y) app(map_1(x1),y) -> map_2(x1,y) app(minus_0(),y) -> minus_1(y) app(minus_1(x1),y) -> minus_2(x1,y) app(p_0(),y) -> p_1(y) app(s_0(),y) -> s_1(y) map_2(f,nil_0()) -> nil_0() map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) minus_2(x,|0|_0()) -> x minus_2(s_1(x),s_1(y)) -> minus_2(p_1(s_1(x)),p_1(s_1(y))) p_1(s_1(x)) -> x div_2(|0|_0(),s_1(y)) -> |0|_0() div_2(s_1(x),s_1(y)) -> s_1(div_2(minus_2(x,id_1(y)),s_1(y))) id_1(x) -> x id_1(x) -> s_1(s_1(s_1(x))) id_1(p_1(x)) -> id_1(s_1(id_1(x))) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: app#(div_1(x1),y) -> div_2#(x1,y) p2: app#(id_0(),y) -> id_1#(y) p3: app#(map_1(x1),y) -> map_2#(x1,y) p4: app#(minus_1(x1),y) -> minus_2#(x1,y) p5: app#(p_0(),y) -> p_1#(y) p6: map_2#(f,cons_2(x,xs)) -> app#(f,x) p7: map_2#(f,cons_2(x,xs)) -> map_2#(f,xs) p8: minus_2#(s_1(x),s_1(y)) -> minus_2#(p_1(s_1(x)),p_1(s_1(y))) p9: minus_2#(s_1(x),s_1(y)) -> p_1#(s_1(x)) p10: minus_2#(s_1(x),s_1(y)) -> p_1#(s_1(y)) p11: div_2#(s_1(x),s_1(y)) -> div_2#(minus_2(x,id_1(y)),s_1(y)) p12: div_2#(s_1(x),s_1(y)) -> minus_2#(x,id_1(y)) p13: div_2#(s_1(x),s_1(y)) -> id_1#(y) p14: id_1#(p_1(x)) -> id_1#(s_1(id_1(x))) p15: id_1#(p_1(x)) -> id_1#(x) and R consists of: r1: app(cons_0(),y) -> cons_1(y) r2: app(cons_1(x1),y) -> cons_2(x1,y) r3: app(div_0(),y) -> div_1(y) r4: app(div_1(x1),y) -> div_2(x1,y) r5: app(id_0(),y) -> id_1(y) r6: app(map_0(),y) -> map_1(y) r7: app(map_1(x1),y) -> map_2(x1,y) r8: app(minus_0(),y) -> minus_1(y) r9: app(minus_1(x1),y) -> minus_2(x1,y) r10: app(p_0(),y) -> p_1(y) r11: app(s_0(),y) -> s_1(y) r12: map_2(f,nil_0()) -> nil_0() r13: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r14: minus_2(x,|0|_0()) -> x r15: minus_2(s_1(x),s_1(y)) -> minus_2(p_1(s_1(x)),p_1(s_1(y))) r16: p_1(s_1(x)) -> x r17: div_2(|0|_0(),s_1(y)) -> |0|_0() r18: div_2(s_1(x),s_1(y)) -> s_1(div_2(minus_2(x,id_1(y)),s_1(y))) r19: id_1(x) -> x r20: id_1(x) -> s_1(s_1(s_1(x))) r21: id_1(p_1(x)) -> id_1(s_1(id_1(x))) The estimated dependency graph contains the following SCCs: {p3, p6, p7} {p11} {p15} {p8} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: map_2#(f,cons_2(x,xs)) -> app#(f,x) p2: app#(map_1(x1),y) -> map_2#(x1,y) p3: 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(div_0(),y) -> div_1(y) r4: app(div_1(x1),y) -> div_2(x1,y) r5: app(id_0(),y) -> id_1(y) r6: app(map_0(),y) -> map_1(y) r7: app(map_1(x1),y) -> map_2(x1,y) r8: app(minus_0(),y) -> minus_1(y) r9: app(minus_1(x1),y) -> minus_2(x1,y) r10: app(p_0(),y) -> p_1(y) r11: app(s_0(),y) -> s_1(y) r12: map_2(f,nil_0()) -> nil_0() r13: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r14: minus_2(x,|0|_0()) -> x r15: minus_2(s_1(x),s_1(y)) -> minus_2(p_1(s_1(x)),p_1(s_1(y))) r16: p_1(s_1(x)) -> x r17: div_2(|0|_0(),s_1(y)) -> |0|_0() r18: div_2(s_1(x),s_1(y)) -> s_1(div_2(minus_2(x,id_1(y)),s_1(y))) r19: id_1(x) -> x r20: id_1(x) -> s_1(s_1(s_1(x))) r21: id_1(p_1(x)) -> id_1(s_1(id_1(x))) The set of usable rules consists of r1, r2, r3, r8, r11, r17, r20 Take the reduction pair: generalized weighted path order (>=MG, >MG) base order 1: max/plus interpretation on natural numbers: map_2#_A(x1,x2) = x1 + 3 cons_2_A(x1,x2) = max{7, x1 - 30, x2 - 30} app#_A(x1,x2) = max{2, x1 - 1} map_1_A(x1) = max{14, x1 + 5} app_A(x1,x2) = max{26, x1 - 15, x2 - 14} cons_0_A = 16 cons_1_A(x1) = max{23, x1 - 15} div_0_A = 16 div_1_A(x1) = max{14, x1 - 16} minus_0_A = 16 minus_1_A(x1) = max{14, x1 - 15} s_0_A = 14 s_1_A(x1) = max{20, x1 - 32} div_2_A(x1,x2) = max{21, x1 - 32, x2 - 33} |0|_0_A = 0 id_1_A(x1) = max{22, x1 - 45} base order 2: precedence: map_1 > app = cons_0 > cons_2 > map_2# = cons_1 = id_1 > app# = minus_1 = s_1 = div_2 > div_1 = minus_0 = s_0 = |0|_0 > div_0 partial status: pi(map_2#) = [1] pi(cons_2) = [] pi(app#) = [] pi(map_1) = [1] pi(app) = [] pi(cons_0) = [] pi(cons_1) = [] pi(div_0) = [] pi(div_1) = [] pi(minus_0) = [] pi(minus_1) = [] pi(s_0) = [] pi(s_1) = [] pi(div_2) = [] pi(|0|_0) = [] pi(id_1) = [] The following rules are removed: p1 -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: app#(map_1(x1),y) -> map_2#(x1,y) p2: 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(div_0(),y) -> div_1(y) r4: app(div_1(x1),y) -> div_2(x1,y) r5: app(id_0(),y) -> id_1(y) r6: app(map_0(),y) -> map_1(y) r7: app(map_1(x1),y) -> map_2(x1,y) r8: app(minus_0(),y) -> minus_1(y) r9: app(minus_1(x1),y) -> minus_2(x1,y) r10: app(p_0(),y) -> p_1(y) r11: app(s_0(),y) -> s_1(y) r12: map_2(f,nil_0()) -> nil_0() r13: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r14: minus_2(x,|0|_0()) -> x r15: minus_2(s_1(x),s_1(y)) -> minus_2(p_1(s_1(x)),p_1(s_1(y))) r16: p_1(s_1(x)) -> x r17: div_2(|0|_0(),s_1(y)) -> |0|_0() r18: div_2(s_1(x),s_1(y)) -> s_1(div_2(minus_2(x,id_1(y)),s_1(y))) r19: id_1(x) -> x r20: id_1(x) -> s_1(s_1(s_1(x))) r21: id_1(p_1(x)) -> id_1(s_1(id_1(x))) The estimated dependency graph contains the following SCCs: {p2} -- 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(div_0(),y) -> div_1(y) r4: app(div_1(x1),y) -> div_2(x1,y) r5: app(id_0(),y) -> id_1(y) r6: app(map_0(),y) -> map_1(y) r7: app(map_1(x1),y) -> map_2(x1,y) r8: app(minus_0(),y) -> minus_1(y) r9: app(minus_1(x1),y) -> minus_2(x1,y) r10: app(p_0(),y) -> p_1(y) r11: app(s_0(),y) -> s_1(y) r12: map_2(f,nil_0()) -> nil_0() r13: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r14: minus_2(x,|0|_0()) -> x r15: minus_2(s_1(x),s_1(y)) -> minus_2(p_1(s_1(x)),p_1(s_1(y))) r16: p_1(s_1(x)) -> x r17: div_2(|0|_0(),s_1(y)) -> |0|_0() r18: div_2(s_1(x),s_1(y)) -> s_1(div_2(minus_2(x,id_1(y)),s_1(y))) r19: id_1(x) -> x r20: id_1(x) -> s_1(s_1(s_1(x))) r21: id_1(p_1(x)) -> id_1(s_1(id_1(x))) The set of usable rules consists of r1, r3, r6, r8, r11, r17, r20 Take the reduction pair: generalized weighted path order (>=MG, >MG) base order 1: max/plus interpretation on natural numbers: map_2#_A(x1,x2) = x2 + 160 cons_2_A(x1,x2) = max{x1 - 91, x2 + 161} app_A(x1,x2) = max{68, x2 - 91} cons_0_A = 1 cons_1_A(x1) = max{66, x1 - 91} div_0_A = 66 div_1_A(x1) = max{65, x1 - 91} map_0_A = 1 map_1_A(x1) = 68 minus_0_A = 1 minus_1_A(x1) = max{68, x1 - 91} s_0_A = 1 s_1_A(x1) = max{56, x1 - 92} div_2_A(x1,x2) = max{66, x1 - 83, x2 - 113} |0|_0_A = 55 id_1_A(x1) = max{67, x1 - 129} base order 2: precedence: cons_2 > map_2# = app = cons_0 > cons_1 = map_1 = id_1 > map_0 = s_1 = div_2 > div_1 = minus_1 = s_0 = |0|_0 > div_0 = minus_0 partial status: pi(map_2#) = [2] pi(cons_2) = [2] pi(app) = [] pi(cons_0) = [] pi(cons_1) = [] pi(div_0) = [] pi(div_1) = [] pi(map_0) = [] pi(map_1) = [] pi(minus_0) = [] pi(minus_1) = [] pi(s_0) = [] pi(s_1) = [] pi(div_2) = [] pi(|0|_0) = [] pi(id_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: div_2#(s_1(x),s_1(y)) -> div_2#(minus_2(x,id_1(y)),s_1(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(div_0(),y) -> div_1(y) r4: app(div_1(x1),y) -> div_2(x1,y) r5: app(id_0(),y) -> id_1(y) r6: app(map_0(),y) -> map_1(y) r7: app(map_1(x1),y) -> map_2(x1,y) r8: app(minus_0(),y) -> minus_1(y) r9: app(minus_1(x1),y) -> minus_2(x1,y) r10: app(p_0(),y) -> p_1(y) r11: app(s_0(),y) -> s_1(y) r12: map_2(f,nil_0()) -> nil_0() r13: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r14: minus_2(x,|0|_0()) -> x r15: minus_2(s_1(x),s_1(y)) -> minus_2(p_1(s_1(x)),p_1(s_1(y))) r16: p_1(s_1(x)) -> x r17: div_2(|0|_0(),s_1(y)) -> |0|_0() r18: div_2(s_1(x),s_1(y)) -> s_1(div_2(minus_2(x,id_1(y)),s_1(y))) r19: id_1(x) -> x r20: id_1(x) -> s_1(s_1(s_1(x))) r21: id_1(p_1(x)) -> id_1(s_1(id_1(x))) The set of usable rules consists of r1, r3, r6, r8, r14, r15, r16, r17 Take the reduction pair: generalized weighted path order (>=MG, >MG) base order 1: max/plus interpretation on natural numbers: div_2#_A(x1,x2) = max{1, x1 - 6} s_1_A(x1) = max{33, x1 + 8} minus_2_A(x1,x2) = x1 + 3 id_1_A(x1) = max{15, x1 - 10} app_A(x1,x2) = max{34, x1 - 4, x2 - 9} cons_0_A = 3 cons_1_A(x1) = 2 div_0_A = 40 div_1_A(x1) = 35 map_0_A = 3 map_1_A(x1) = max{2, x1 - 10} minus_0_A = 3 minus_1_A(x1) = max{0, x1 - 9} |0|_0_A = 32 p_1_A(x1) = max{33, x1} div_2_A(x1,x2) = max{34, x2 - 42} base order 2: precedence: p_1 > div_2# = s_1 = minus_2 > app = cons_0 = div_0 = map_0 = minus_0 > id_1 = map_1 = minus_1 > cons_1 = div_2 > div_1 = |0|_0 partial status: pi(div_2#) = [] pi(s_1) = [] pi(minus_2) = [] pi(id_1) = [] pi(app) = [] pi(cons_0) = [] pi(cons_1) = [] pi(div_0) = [] pi(div_1) = [] pi(map_0) = [] pi(map_1) = [] pi(minus_0) = [] pi(minus_1) = [] pi(|0|_0) = [] pi(p_1) = [1] pi(div_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: id_1#(p_1(x)) -> id_1#(x) and R consists of: r1: app(cons_0(),y) -> cons_1(y) r2: app(cons_1(x1),y) -> cons_2(x1,y) r3: app(div_0(),y) -> div_1(y) r4: app(div_1(x1),y) -> div_2(x1,y) r5: app(id_0(),y) -> id_1(y) r6: app(map_0(),y) -> map_1(y) r7: app(map_1(x1),y) -> map_2(x1,y) r8: app(minus_0(),y) -> minus_1(y) r9: app(minus_1(x1),y) -> minus_2(x1,y) r10: app(p_0(),y) -> p_1(y) r11: app(s_0(),y) -> s_1(y) r12: map_2(f,nil_0()) -> nil_0() r13: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r14: minus_2(x,|0|_0()) -> x r15: minus_2(s_1(x),s_1(y)) -> minus_2(p_1(s_1(x)),p_1(s_1(y))) r16: p_1(s_1(x)) -> x r17: div_2(|0|_0(),s_1(y)) -> |0|_0() r18: div_2(s_1(x),s_1(y)) -> s_1(div_2(minus_2(x,id_1(y)),s_1(y))) r19: id_1(x) -> x r20: id_1(x) -> s_1(s_1(s_1(x))) r21: id_1(p_1(x)) -> id_1(s_1(id_1(x))) The set of usable rules consists of r1, r2, r3, r6, r8, r11, r17, r20 Take the reduction pair: generalized weighted path order (>=MG, >MG) base order 1: max/plus interpretation on natural numbers: id_1#_A(x1) = max{23, x1 + 12} p_1_A(x1) = max{23, x1 + 12} app_A(x1,x2) = max{17, x1 - 21, x2 - 19} cons_0_A = 13 cons_1_A(x1) = max{14, x1 - 20} cons_2_A(x1,x2) = max{15, x1 - 42, x2 - 24} div_0_A = 9 div_1_A(x1) = max{10, x1 - 20} map_0_A = 20 map_1_A(x1) = max{1, x1 - 20} minus_0_A = 20 minus_1_A(x1) = max{0, x1 - 20} s_0_A = 12 s_1_A(x1) = max{13, x1 - 54} div_2_A(x1,x2) = max{11, x1 - 42, x2 - 66} |0|_0_A = 0 id_1_A(x1) = max{16, x1 - 52} base order 2: precedence: p_1 > id_1# = app = map_0 > cons_2 = map_1 = id_1 > cons_1 = s_1 > cons_0 = minus_1 = s_0 = div_2 > div_1 = minus_0 = |0|_0 > div_0 partial status: pi(id_1#) = [1] pi(p_1) = [1] pi(app) = [] pi(cons_0) = [] pi(cons_1) = [] pi(cons_2) = [] pi(div_0) = [] pi(div_1) = [] pi(map_0) = [] pi(map_1) = [] pi(minus_0) = [] pi(minus_1) = [] pi(s_0) = [] pi(s_1) = [] pi(div_2) = [] pi(|0|_0) = [] pi(id_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: minus_2#(s_1(x),s_1(y)) -> minus_2#(p_1(s_1(x)),p_1(s_1(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(div_0(),y) -> div_1(y) r4: app(div_1(x1),y) -> div_2(x1,y) r5: app(id_0(),y) -> id_1(y) r6: app(map_0(),y) -> map_1(y) r7: app(map_1(x1),y) -> map_2(x1,y) r8: app(minus_0(),y) -> minus_1(y) r9: app(minus_1(x1),y) -> minus_2(x1,y) r10: app(p_0(),y) -> p_1(y) r11: app(s_0(),y) -> s_1(y) r12: map_2(f,nil_0()) -> nil_0() r13: map_2(f,cons_2(x,xs)) -> cons_2(app(f,x),map_2(f,xs)) r14: minus_2(x,|0|_0()) -> x r15: minus_2(s_1(x),s_1(y)) -> minus_2(p_1(s_1(x)),p_1(s_1(y))) r16: p_1(s_1(x)) -> x r17: div_2(|0|_0(),s_1(y)) -> |0|_0() r18: div_2(s_1(x),s_1(y)) -> s_1(div_2(minus_2(x,id_1(y)),s_1(y))) r19: id_1(x) -> x r20: id_1(x) -> s_1(s_1(s_1(x))) r21: id_1(p_1(x)) -> id_1(s_1(id_1(x))) The set of usable rules consists of r1, r2, r3, r6, r8, r10, r16, r17 Take the reduction pair: generalized weighted path order (>=MG, >MG) base order 1: max/plus interpretation on natural numbers: minus_2#_A(x1,x2) = max{6, x1 + 3} s_1_A(x1) = x1 + 9 p_1_A(x1) = max{5, x1 - 8} app_A(x1,x2) = max{19, x1 - 13, x2 - 7} cons_0_A = 1 cons_1_A(x1) = max{2, x1 - 8} cons_2_A(x1,x2) = max{3, x1 - 22, x2 - 36} div_0_A = 12 div_1_A(x1) = max{1, x1 - 34} map_0_A = 11 map_1_A(x1) = max{12, x1 - 36} minus_0_A = 11 minus_1_A(x1) = max{12, x1 - 8} p_0_A = 4 div_2_A(x1,x2) = max{10, x1 - 33, x2 - 67} |0|_0_A = 5 base order 2: precedence: div_2 > minus_2# = s_1 > app = cons_0 = |0|_0 > p_1 = cons_2 = div_1 = map_1 = minus_1 > cons_1 = div_0 = map_0 = minus_0 = p_0 partial status: pi(minus_2#) = [1] pi(s_1) = [1] pi(p_1) = [] pi(app) = [] pi(cons_0) = [] pi(cons_1) = [] pi(cons_2) = [] pi(div_0) = [] pi(div_1) = [] pi(map_0) = [] pi(map_1) = [] pi(minus_0) = [] pi(minus_1) = [] pi(p_0) = [] pi(div_2) = [] pi(|0|_0) = [] The following rules are removed: p1 Then no dependency pair remains.