YES We show the termination of the TRS R: p(|0|()) -> |0|() p(s(x)) -> x plus(x,|0|()) -> x plus(|0|(),y) -> y plus(s(x),y) -> s(plus(x,y)) plus(s(x),y) -> s(plus(p(s(x)),y)) plus(x,s(y)) -> s(plus(x,p(s(y)))) times(|0|(),y) -> |0|() times(s(|0|()),y) -> y times(s(x),y) -> plus(y,times(x,y)) div(|0|(),y) -> |0|() div(x,y) -> quot(x,y,y) quot(zero(y),s(y),z) -> |0|() quot(s(x),s(y),z) -> quot(x,y,z) quot(x,|0|(),s(z)) -> s(div(x,s(z))) div(div(x,y),z) -> div(x,times(zero(y),z)) eq(|0|(),|0|()) -> true() eq(s(x),|0|()) -> false() eq(|0|(),s(y)) -> false() eq(s(x),s(y)) -> eq(x,y) divides(y,x) -> eq(x,times(div(x,y),y)) prime(s(s(x))) -> pr(s(s(x)),s(x)) pr(x,s(|0|())) -> true() pr(x,s(s(y))) -> if(divides(s(s(y)),x),x,s(y)) if(true(),x,y) -> false() if(false(),x,y) -> pr(x,y) zero(div(x,x)) -> x zero(divides(x,x)) -> x zero(times(x,x)) -> x zero(quot(x,x,x)) -> x zero(s(x)) -> if(eq(x,s(|0|())),plus(zero(|0|()),|0|()),s(plus(|0|(),zero(|0|())))) -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: plus#(s(x),y) -> plus#(x,y) p2: plus#(s(x),y) -> plus#(p(s(x)),y) p3: plus#(s(x),y) -> p#(s(x)) p4: plus#(x,s(y)) -> plus#(x,p(s(y))) p5: plus#(x,s(y)) -> p#(s(y)) p6: times#(s(x),y) -> plus#(y,times(x,y)) p7: times#(s(x),y) -> times#(x,y) p8: div#(x,y) -> quot#(x,y,y) p9: quot#(s(x),s(y),z) -> quot#(x,y,z) p10: quot#(x,|0|(),s(z)) -> div#(x,s(z)) p11: div#(div(x,y),z) -> div#(x,times(zero(y),z)) p12: div#(div(x,y),z) -> times#(zero(y),z) p13: div#(div(x,y),z) -> zero#(y) p14: eq#(s(x),s(y)) -> eq#(x,y) p15: divides#(y,x) -> eq#(x,times(div(x,y),y)) p16: divides#(y,x) -> times#(div(x,y),y) p17: divides#(y,x) -> div#(x,y) p18: prime#(s(s(x))) -> pr#(s(s(x)),s(x)) p19: pr#(x,s(s(y))) -> if#(divides(s(s(y)),x),x,s(y)) p20: pr#(x,s(s(y))) -> divides#(s(s(y)),x) p21: if#(false(),x,y) -> pr#(x,y) p22: zero#(s(x)) -> if#(eq(x,s(|0|())),plus(zero(|0|()),|0|()),s(plus(|0|(),zero(|0|())))) p23: zero#(s(x)) -> eq#(x,s(|0|())) p24: zero#(s(x)) -> plus#(zero(|0|()),|0|()) p25: zero#(s(x)) -> zero#(|0|()) p26: zero#(s(x)) -> plus#(|0|(),zero(|0|())) and R consists of: r1: p(|0|()) -> |0|() r2: p(s(x)) -> x r3: plus(x,|0|()) -> x r4: plus(|0|(),y) -> y r5: plus(s(x),y) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(p(s(x)),y)) r7: plus(x,s(y)) -> s(plus(x,p(s(y)))) r8: times(|0|(),y) -> |0|() r9: times(s(|0|()),y) -> y r10: times(s(x),y) -> plus(y,times(x,y)) r11: div(|0|(),y) -> |0|() r12: div(x,y) -> quot(x,y,y) r13: quot(zero(y),s(y),z) -> |0|() r14: quot(s(x),s(y),z) -> quot(x,y,z) r15: quot(x,|0|(),s(z)) -> s(div(x,s(z))) r16: div(div(x,y),z) -> div(x,times(zero(y),z)) r17: eq(|0|(),|0|()) -> true() r18: eq(s(x),|0|()) -> false() r19: eq(|0|(),s(y)) -> false() r20: eq(s(x),s(y)) -> eq(x,y) r21: divides(y,x) -> eq(x,times(div(x,y),y)) r22: prime(s(s(x))) -> pr(s(s(x)),s(x)) r23: pr(x,s(|0|())) -> true() r24: pr(x,s(s(y))) -> if(divides(s(s(y)),x),x,s(y)) r25: if(true(),x,y) -> false() r26: if(false(),x,y) -> pr(x,y) r27: zero(div(x,x)) -> x r28: zero(divides(x,x)) -> x r29: zero(times(x,x)) -> x r30: zero(quot(x,x,x)) -> x r31: zero(s(x)) -> if(eq(x,s(|0|())),plus(zero(|0|()),|0|()),s(plus(|0|(),zero(|0|())))) The estimated dependency graph contains the following SCCs: {p8, p9, p10, p11, p13, p17, p19, p20, p21, p22} {p7} {p1, p2, p4} {p14} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: pr#(x,s(s(y))) -> divides#(s(s(y)),x) p2: divides#(y,x) -> div#(x,y) p3: div#(div(x,y),z) -> zero#(y) p4: zero#(s(x)) -> if#(eq(x,s(|0|())),plus(zero(|0|()),|0|()),s(plus(|0|(),zero(|0|())))) p5: if#(false(),x,y) -> pr#(x,y) p6: pr#(x,s(s(y))) -> if#(divides(s(s(y)),x),x,s(y)) p7: div#(div(x,y),z) -> div#(x,times(zero(y),z)) p8: div#(x,y) -> quot#(x,y,y) p9: quot#(x,|0|(),s(z)) -> div#(x,s(z)) p10: quot#(s(x),s(y),z) -> quot#(x,y,z) and R consists of: r1: p(|0|()) -> |0|() r2: p(s(x)) -> x r3: plus(x,|0|()) -> x r4: plus(|0|(),y) -> y r5: plus(s(x),y) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(p(s(x)),y)) r7: plus(x,s(y)) -> s(plus(x,p(s(y)))) r8: times(|0|(),y) -> |0|() r9: times(s(|0|()),y) -> y r10: times(s(x),y) -> plus(y,times(x,y)) r11: div(|0|(),y) -> |0|() r12: div(x,y) -> quot(x,y,y) r13: quot(zero(y),s(y),z) -> |0|() r14: quot(s(x),s(y),z) -> quot(x,y,z) r15: quot(x,|0|(),s(z)) -> s(div(x,s(z))) r16: div(div(x,y),z) -> div(x,times(zero(y),z)) r17: eq(|0|(),|0|()) -> true() r18: eq(s(x),|0|()) -> false() r19: eq(|0|(),s(y)) -> false() r20: eq(s(x),s(y)) -> eq(x,y) r21: divides(y,x) -> eq(x,times(div(x,y),y)) r22: prime(s(s(x))) -> pr(s(s(x)),s(x)) r23: pr(x,s(|0|())) -> true() r24: pr(x,s(s(y))) -> if(divides(s(s(y)),x),x,s(y)) r25: if(true(),x,y) -> false() r26: if(false(),x,y) -> pr(x,y) r27: zero(div(x,x)) -> x r28: zero(divides(x,x)) -> x r29: zero(times(x,x)) -> x r30: zero(quot(x,x,x)) -> x r31: zero(s(x)) -> if(eq(x,s(|0|())),plus(zero(|0|()),|0|()),s(plus(|0|(),zero(|0|())))) The set of usable rules consists of r3, r4, r8, r11, r17, r18, r19, r20, r21 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!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: pr#_A(x1,x2) = x1 s_A(x1) = x1 + 20 divides#_A(x1,x2) = x2 div#_A(x1,x2) = x1 div_A(x1,x2) = x1 + x2 + 1 zero#_A(x1) = x1 if#_A(x1,x2,x3) = x2 eq_A(x1,x2) = 4 |0|_A() = 5 plus_A(x1,x2) = x1 + x2 + 1 zero_A(x1) = 1 false_A() = 4 divides_A(x1,x2) = 4 times_A(x1,x2) = x1 + 1 quot#_A(x1,x2,x3) = x1 true_A() = 4 pr#!_A(x1,x2) = x1 + x2 + 3 s!_A(x1) = 39 divides#!_A(x1,x2) = x2 + 42 div#!_A(x1,x2) = 41 div!_A(x1,x2) = 42 zero#!_A(x1) = 40 if#!_A(x1,x2,x3) = x1 + x2 + x3 eq!_A(x1,x2) = x1 + 36 |0|!_A() = 19 plus!_A(x1,x2) = x1 + 36 zero!_A(x1) = 38 false!_A() = 40 divides!_A(x1,x2) = x2 + 38 times!_A(x1,x2) = x1 + 15 quot#!_A(x1,x2,x3) = 41 true!_A() = 18 2. marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: pr#_A(x1,x2) = 1 s_A(x1) = x1 + 21 divides#_A(x1,x2) = 1 div#_A(x1,x2) = 1 div_A(x1,x2) = max{x1 + 14, x2 - 4} zero#_A(x1) = 1 if#_A(x1,x2,x3) = 1 eq_A(x1,x2) = 52 |0|_A = 0 plus_A(x1,x2) = max{x1 + 78, x2 + 5} zero_A(x1) = max{45, x1 - 27} false_A = 52 divides_A(x1,x2) = max{52, x1 + 6} times_A(x1,x2) = 32 quot#_A(x1,x2,x3) = 1 true_A = 52 pr#!_A(x1,x2) = x2 + 47 s!_A(x1) = max{87, x1 - 16} divides#!_A(x1,x2) = max{x1 + 100, x2 + 100} div#!_A(x1,x2) = 99 div!_A(x1,x2) = max{61, x1 - 45} zero#!_A(x1) = 7 if#!_A(x1,x2,x3) = max{x1 - 46, x3 + 67} eq!_A(x1,x2) = 37 |0|!_A = 39 plus!_A(x1,x2) = max{x1 - 38, x2 + 41} zero!_A(x1) = 62 false!_A = 36 divides!_A(x1,x2) = max{90, x1 - 19, x2 - 46} times!_A(x1,x2) = max{98, x1 + 77, x2 + 38} quot#!_A(x1,x2,x3) = 99 true!_A = 38 partial status: pi(pr#) = [] pi(s) = [] pi(divides#) = [] pi(div#) = [] pi(div) = [1, 2] pi(zero#) = [] pi(if#) = [] pi(eq) = [] pi(|0|) = [] pi(plus) = [1, 2] pi(zero) = [] pi(false) = [] pi(divides) = [2] pi(times) = [] pi(quot#) = [] pi(true) = [] The following rules are removed: p1, p2, p3, p4, p5, p6 -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: div#(div(x,y),z) -> div#(x,times(zero(y),z)) p2: div#(x,y) -> quot#(x,y,y) p3: quot#(x,|0|(),s(z)) -> div#(x,s(z)) p4: quot#(s(x),s(y),z) -> quot#(x,y,z) and R consists of: r1: p(|0|()) -> |0|() r2: p(s(x)) -> x r3: plus(x,|0|()) -> x r4: plus(|0|(),y) -> y r5: plus(s(x),y) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(p(s(x)),y)) r7: plus(x,s(y)) -> s(plus(x,p(s(y)))) r8: times(|0|(),y) -> |0|() r9: times(s(|0|()),y) -> y r10: times(s(x),y) -> plus(y,times(x,y)) r11: div(|0|(),y) -> |0|() r12: div(x,y) -> quot(x,y,y) r13: quot(zero(y),s(y),z) -> |0|() r14: quot(s(x),s(y),z) -> quot(x,y,z) r15: quot(x,|0|(),s(z)) -> s(div(x,s(z))) r16: div(div(x,y),z) -> div(x,times(zero(y),z)) r17: eq(|0|(),|0|()) -> true() r18: eq(s(x),|0|()) -> false() r19: eq(|0|(),s(y)) -> false() r20: eq(s(x),s(y)) -> eq(x,y) r21: divides(y,x) -> eq(x,times(div(x,y),y)) r22: prime(s(s(x))) -> pr(s(s(x)),s(x)) r23: pr(x,s(|0|())) -> true() r24: pr(x,s(s(y))) -> if(divides(s(s(y)),x),x,s(y)) r25: if(true(),x,y) -> false() r26: if(false(),x,y) -> pr(x,y) r27: zero(div(x,x)) -> x r28: zero(divides(x,x)) -> x r29: zero(times(x,x)) -> x r30: zero(quot(x,x,x)) -> x r31: zero(s(x)) -> if(eq(x,s(|0|())),plus(zero(|0|()),|0|()),s(plus(|0|(),zero(|0|())))) 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: div#(div(x,y),z) -> div#(x,times(zero(y),z)) p2: div#(x,y) -> quot#(x,y,y) p3: quot#(s(x),s(y),z) -> quot#(x,y,z) p4: quot#(x,|0|(),s(z)) -> div#(x,s(z)) and R consists of: r1: p(|0|()) -> |0|() r2: p(s(x)) -> x r3: plus(x,|0|()) -> x r4: plus(|0|(),y) -> y r5: plus(s(x),y) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(p(s(x)),y)) r7: plus(x,s(y)) -> s(plus(x,p(s(y)))) r8: times(|0|(),y) -> |0|() r9: times(s(|0|()),y) -> y r10: times(s(x),y) -> plus(y,times(x,y)) r11: div(|0|(),y) -> |0|() r12: div(x,y) -> quot(x,y,y) r13: quot(zero(y),s(y),z) -> |0|() r14: quot(s(x),s(y),z) -> quot(x,y,z) r15: quot(x,|0|(),s(z)) -> s(div(x,s(z))) r16: div(div(x,y),z) -> div(x,times(zero(y),z)) r17: eq(|0|(),|0|()) -> true() r18: eq(s(x),|0|()) -> false() r19: eq(|0|(),s(y)) -> false() r20: eq(s(x),s(y)) -> eq(x,y) r21: divides(y,x) -> eq(x,times(div(x,y),y)) r22: prime(s(s(x))) -> pr(s(s(x)),s(x)) r23: pr(x,s(|0|())) -> true() r24: pr(x,s(s(y))) -> if(divides(s(s(y)),x),x,s(y)) r25: if(true(),x,y) -> false() r26: if(false(),x,y) -> pr(x,y) r27: zero(div(x,x)) -> x r28: zero(divides(x,x)) -> x r29: zero(times(x,x)) -> x r30: zero(quot(x,x,x)) -> x r31: zero(s(x)) -> if(eq(x,s(|0|())),plus(zero(|0|()),|0|()),s(plus(|0|(),zero(|0|())))) The set of usable rules consists of r9, r11 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!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: div#_A(x1,x2) = x1 div_A(x1,x2) = x1 + x2 + 6 times_A(x1,x2) = x2 + 7 zero_A(x1) = 4 quot#_A(x1,x2,x3) = x1 s_A(x1) = x1 + 4 |0|_A() = 12 div#!_A(x1,x2) = x1 + 6 div!_A(x1,x2) = x1 + 5 times!_A(x1,x2) = x2 + 8 zero!_A(x1) = 10 quot#!_A(x1,x2,x3) = x1 + 6 s!_A(x1) = 9 |0|!_A() = 7 2. marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: div#_A(x1,x2) = max{1, x1 - 309} div_A(x1,x2) = max{308, x1 + 1, x2 - 2} times_A(x1,x2) = max{x1 - 113, x2 + 195} zero_A(x1) = max{113, x1 - 125} quot#_A(x1,x2,x3) = max{1, x1 - 309} s_A(x1) = max{83, x1} |0|_A = 194 div#!_A(x1,x2) = x1 + 7 div!_A(x1,x2) = max{312, x1 + 3} times!_A(x1,x2) = max{316, x1 - 309, x2 + 239} zero!_A(x1) = max{312, x1 - 211} quot#!_A(x1,x2,x3) = x1 + 7 s!_A(x1) = max{10, x1 + 8} |0|!_A = 9 partial status: pi(div#) = [1] pi(div) = [1, 2] pi(times) = [1, 2] pi(zero) = [1] pi(quot#) = [1] pi(s) = [1] pi(|0|) = [] The following rules are removed: p1, p3 -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: div#(x,y) -> quot#(x,y,y) p2: quot#(x,|0|(),s(z)) -> div#(x,s(z)) and R consists of: r1: p(|0|()) -> |0|() r2: p(s(x)) -> x r3: plus(x,|0|()) -> x r4: plus(|0|(),y) -> y r5: plus(s(x),y) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(p(s(x)),y)) r7: plus(x,s(y)) -> s(plus(x,p(s(y)))) r8: times(|0|(),y) -> |0|() r9: times(s(|0|()),y) -> y r10: times(s(x),y) -> plus(y,times(x,y)) r11: div(|0|(),y) -> |0|() r12: div(x,y) -> quot(x,y,y) r13: quot(zero(y),s(y),z) -> |0|() r14: quot(s(x),s(y),z) -> quot(x,y,z) r15: quot(x,|0|(),s(z)) -> s(div(x,s(z))) r16: div(div(x,y),z) -> div(x,times(zero(y),z)) r17: eq(|0|(),|0|()) -> true() r18: eq(s(x),|0|()) -> false() r19: eq(|0|(),s(y)) -> false() r20: eq(s(x),s(y)) -> eq(x,y) r21: divides(y,x) -> eq(x,times(div(x,y),y)) r22: prime(s(s(x))) -> pr(s(s(x)),s(x)) r23: pr(x,s(|0|())) -> true() r24: pr(x,s(s(y))) -> if(divides(s(s(y)),x),x,s(y)) r25: if(true(),x,y) -> false() r26: if(false(),x,y) -> pr(x,y) r27: zero(div(x,x)) -> x r28: zero(divides(x,x)) -> x r29: zero(times(x,x)) -> x r30: zero(quot(x,x,x)) -> x r31: zero(s(x)) -> if(eq(x,s(|0|())),plus(zero(|0|()),|0|()),s(plus(|0|(),zero(|0|())))) The estimated dependency graph contains the following SCCs: {p1, p2} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: div#(x,y) -> quot#(x,y,y) p2: quot#(x,|0|(),s(z)) -> div#(x,s(z)) and R consists of: r1: p(|0|()) -> |0|() r2: p(s(x)) -> x r3: plus(x,|0|()) -> x r4: plus(|0|(),y) -> y r5: plus(s(x),y) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(p(s(x)),y)) r7: plus(x,s(y)) -> s(plus(x,p(s(y)))) r8: times(|0|(),y) -> |0|() r9: times(s(|0|()),y) -> y r10: times(s(x),y) -> plus(y,times(x,y)) r11: div(|0|(),y) -> |0|() r12: div(x,y) -> quot(x,y,y) r13: quot(zero(y),s(y),z) -> |0|() r14: quot(s(x),s(y),z) -> quot(x,y,z) r15: quot(x,|0|(),s(z)) -> s(div(x,s(z))) r16: div(div(x,y),z) -> div(x,times(zero(y),z)) r17: eq(|0|(),|0|()) -> true() r18: eq(s(x),|0|()) -> false() r19: eq(|0|(),s(y)) -> false() r20: eq(s(x),s(y)) -> eq(x,y) r21: divides(y,x) -> eq(x,times(div(x,y),y)) r22: prime(s(s(x))) -> pr(s(s(x)),s(x)) r23: pr(x,s(|0|())) -> true() r24: pr(x,s(s(y))) -> if(divides(s(s(y)),x),x,s(y)) r25: if(true(),x,y) -> false() r26: if(false(),x,y) -> pr(x,y) r27: zero(div(x,x)) -> x r28: zero(divides(x,x)) -> x r29: zero(times(x,x)) -> x r30: zero(quot(x,x,x)) -> x r31: zero(s(x)) -> if(eq(x,s(|0|())),plus(zero(|0|()),|0|()),s(plus(|0|(),zero(|0|())))) 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!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: div#_A(x1,x2) = x2 quot#_A(x1,x2,x3) = x2 |0|_A() = 5 s_A(x1) = 3 div#!_A(x1,x2) = 10 quot#!_A(x1,x2,x3) = 10 |0|!_A() = 6 s!_A(x1) = x1 + 9 2. marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: div#_A(x1,x2) = max{93, x1 - 1, x2 - 101} quot#_A(x1,x2,x3) = max{93, x1 - 1, x2 - 217, x3 - 101} |0|_A = 216 s_A(x1) = 193 div#!_A(x1,x2) = max{20, x2 - 194} quot#!_A(x1,x2,x3) = max{1, x2 - 195} |0|!_A = 86 s!_A(x1) = max{88, x1 + 19} partial status: pi(div#) = [1] pi(quot#) = [1] pi(|0|) = [] pi(s) = [1] 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: times#(s(x),y) -> times#(x,y) and R consists of: r1: p(|0|()) -> |0|() r2: p(s(x)) -> x r3: plus(x,|0|()) -> x r4: plus(|0|(),y) -> y r5: plus(s(x),y) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(p(s(x)),y)) r7: plus(x,s(y)) -> s(plus(x,p(s(y)))) r8: times(|0|(),y) -> |0|() r9: times(s(|0|()),y) -> y r10: times(s(x),y) -> plus(y,times(x,y)) r11: div(|0|(),y) -> |0|() r12: div(x,y) -> quot(x,y,y) r13: quot(zero(y),s(y),z) -> |0|() r14: quot(s(x),s(y),z) -> quot(x,y,z) r15: quot(x,|0|(),s(z)) -> s(div(x,s(z))) r16: div(div(x,y),z) -> div(x,times(zero(y),z)) r17: eq(|0|(),|0|()) -> true() r18: eq(s(x),|0|()) -> false() r19: eq(|0|(),s(y)) -> false() r20: eq(s(x),s(y)) -> eq(x,y) r21: divides(y,x) -> eq(x,times(div(x,y),y)) r22: prime(s(s(x))) -> pr(s(s(x)),s(x)) r23: pr(x,s(|0|())) -> true() r24: pr(x,s(s(y))) -> if(divides(s(s(y)),x),x,s(y)) r25: if(true(),x,y) -> false() r26: if(false(),x,y) -> pr(x,y) r27: zero(div(x,x)) -> x r28: zero(divides(x,x)) -> x r29: zero(times(x,x)) -> x r30: zero(quot(x,x,x)) -> x r31: zero(s(x)) -> if(eq(x,s(|0|())),plus(zero(|0|()),|0|()),s(plus(|0|(),zero(|0|())))) 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!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: times#_A(x1,x2) = 0 s_A(x1) = 8 times#!_A(x1,x2) = 0 s!_A(x1) = x1 + 6 2. marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: times#_A(x1,x2) = x1 s_A(x1) = x1 + 18 times#!_A(x1,x2) = max{10, x1 - 1} s!_A(x1) = x1 + 20 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#(s(x),y) -> plus#(x,y) p2: plus#(x,s(y)) -> plus#(x,p(s(y))) p3: plus#(s(x),y) -> plus#(p(s(x)),y) and R consists of: r1: p(|0|()) -> |0|() r2: p(s(x)) -> x r3: plus(x,|0|()) -> x r4: plus(|0|(),y) -> y r5: plus(s(x),y) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(p(s(x)),y)) r7: plus(x,s(y)) -> s(plus(x,p(s(y)))) r8: times(|0|(),y) -> |0|() r9: times(s(|0|()),y) -> y r10: times(s(x),y) -> plus(y,times(x,y)) r11: div(|0|(),y) -> |0|() r12: div(x,y) -> quot(x,y,y) r13: quot(zero(y),s(y),z) -> |0|() r14: quot(s(x),s(y),z) -> quot(x,y,z) r15: quot(x,|0|(),s(z)) -> s(div(x,s(z))) r16: div(div(x,y),z) -> div(x,times(zero(y),z)) r17: eq(|0|(),|0|()) -> true() r18: eq(s(x),|0|()) -> false() r19: eq(|0|(),s(y)) -> false() r20: eq(s(x),s(y)) -> eq(x,y) r21: divides(y,x) -> eq(x,times(div(x,y),y)) r22: prime(s(s(x))) -> pr(s(s(x)),s(x)) r23: pr(x,s(|0|())) -> true() r24: pr(x,s(s(y))) -> if(divides(s(s(y)),x),x,s(y)) r25: if(true(),x,y) -> false() r26: if(false(),x,y) -> pr(x,y) r27: zero(div(x,x)) -> x r28: zero(divides(x,x)) -> x r29: zero(times(x,x)) -> x r30: zero(quot(x,x,x)) -> x r31: zero(s(x)) -> if(eq(x,s(|0|())),plus(zero(|0|()),|0|()),s(plus(|0|(),zero(|0|())))) The set of usable rules consists of r2 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!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: plus#_A(x1,x2) = x1 + x2 s_A(x1) = x1 + 4 p_A(x1) = x1 plus#!_A(x1,x2) = 13 s!_A(x1) = 14 p!_A(x1) = 13 2. marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: plus#_A(x1,x2) = max{0, x1 - 105, x2 - 133} s_A(x1) = x1 + 104 p_A(x1) = max{1, x1 - 103} plus#!_A(x1,x2) = x1 + 26 s!_A(x1) = x1 + 25 p!_A(x1) = max{5, x1 - 97} partial status: pi(plus#) = [1] pi(s) = [1] pi(p) = [1] The following rules are removed: p1, p3 -- SCC decomposition. Consider the dependency pair problem (P, R), where P consists of p1: plus#(x,s(y)) -> plus#(x,p(s(y))) and R consists of: r1: p(|0|()) -> |0|() r2: p(s(x)) -> x r3: plus(x,|0|()) -> x r4: plus(|0|(),y) -> y r5: plus(s(x),y) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(p(s(x)),y)) r7: plus(x,s(y)) -> s(plus(x,p(s(y)))) r8: times(|0|(),y) -> |0|() r9: times(s(|0|()),y) -> y r10: times(s(x),y) -> plus(y,times(x,y)) r11: div(|0|(),y) -> |0|() r12: div(x,y) -> quot(x,y,y) r13: quot(zero(y),s(y),z) -> |0|() r14: quot(s(x),s(y),z) -> quot(x,y,z) r15: quot(x,|0|(),s(z)) -> s(div(x,s(z))) r16: div(div(x,y),z) -> div(x,times(zero(y),z)) r17: eq(|0|(),|0|()) -> true() r18: eq(s(x),|0|()) -> false() r19: eq(|0|(),s(y)) -> false() r20: eq(s(x),s(y)) -> eq(x,y) r21: divides(y,x) -> eq(x,times(div(x,y),y)) r22: prime(s(s(x))) -> pr(s(s(x)),s(x)) r23: pr(x,s(|0|())) -> true() r24: pr(x,s(s(y))) -> if(divides(s(s(y)),x),x,s(y)) r25: if(true(),x,y) -> false() r26: if(false(),x,y) -> pr(x,y) r27: zero(div(x,x)) -> x r28: zero(divides(x,x)) -> x r29: zero(times(x,x)) -> x r30: zero(quot(x,x,x)) -> x r31: zero(s(x)) -> if(eq(x,s(|0|())),plus(zero(|0|()),|0|()),s(plus(|0|(),zero(|0|())))) The estimated dependency graph contains the following SCCs: {p1} -- Reduction pair. Consider the dependency pair problem (P, R), where P consists of p1: plus#(x,s(y)) -> plus#(x,p(s(y))) and R consists of: r1: p(|0|()) -> |0|() r2: p(s(x)) -> x r3: plus(x,|0|()) -> x r4: plus(|0|(),y) -> y r5: plus(s(x),y) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(p(s(x)),y)) r7: plus(x,s(y)) -> s(plus(x,p(s(y)))) r8: times(|0|(),y) -> |0|() r9: times(s(|0|()),y) -> y r10: times(s(x),y) -> plus(y,times(x,y)) r11: div(|0|(),y) -> |0|() r12: div(x,y) -> quot(x,y,y) r13: quot(zero(y),s(y),z) -> |0|() r14: quot(s(x),s(y),z) -> quot(x,y,z) r15: quot(x,|0|(),s(z)) -> s(div(x,s(z))) r16: div(div(x,y),z) -> div(x,times(zero(y),z)) r17: eq(|0|(),|0|()) -> true() r18: eq(s(x),|0|()) -> false() r19: eq(|0|(),s(y)) -> false() r20: eq(s(x),s(y)) -> eq(x,y) r21: divides(y,x) -> eq(x,times(div(x,y),y)) r22: prime(s(s(x))) -> pr(s(s(x)),s(x)) r23: pr(x,s(|0|())) -> true() r24: pr(x,s(s(y))) -> if(divides(s(s(y)),x),x,s(y)) r25: if(true(),x,y) -> false() r26: if(false(),x,y) -> pr(x,y) r27: zero(div(x,x)) -> x r28: zero(divides(x,x)) -> x r29: zero(times(x,x)) -> x r30: zero(quot(x,x,x)) -> x r31: zero(s(x)) -> if(eq(x,s(|0|())),plus(zero(|0|()),|0|()),s(plus(|0|(),zero(|0|())))) The set of usable rules consists of r1, r2, r11 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!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: plus#_A(x1,x2) = x2 s_A(x1) = x1 + 1 p_A(x1) = x1 |0|_A() = 11 div_A(x1,x2) = x1 + x2 + 5 plus#!_A(x1,x2) = 9 s!_A(x1) = 10 p!_A(x1) = 11 |0|!_A() = 6 div!_A(x1,x2) = x1 + 5 2. marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: plus#_A(x1,x2) = max{0, x1 - 1} s_A(x1) = x1 + 5 p_A(x1) = max{1, x1 - 1} |0|_A = 0 div_A(x1,x2) = max{1, x1 - 63, x2 - 71} plus#!_A(x1,x2) = max{1, x2 - 2} s!_A(x1) = x1 + 39 p!_A(x1) = max{47, x1 - 68} |0|!_A = 46 div!_A(x1,x2) = 46 partial status: pi(plus#) = [] pi(s) = [1] pi(p) = [1] pi(|0|) = [] pi(div) = [1, 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: eq#(s(x),s(y)) -> eq#(x,y) and R consists of: r1: p(|0|()) -> |0|() r2: p(s(x)) -> x r3: plus(x,|0|()) -> x r4: plus(|0|(),y) -> y r5: plus(s(x),y) -> s(plus(x,y)) r6: plus(s(x),y) -> s(plus(p(s(x)),y)) r7: plus(x,s(y)) -> s(plus(x,p(s(y)))) r8: times(|0|(),y) -> |0|() r9: times(s(|0|()),y) -> y r10: times(s(x),y) -> plus(y,times(x,y)) r11: div(|0|(),y) -> |0|() r12: div(x,y) -> quot(x,y,y) r13: quot(zero(y),s(y),z) -> |0|() r14: quot(s(x),s(y),z) -> quot(x,y,z) r15: quot(x,|0|(),s(z)) -> s(div(x,s(z))) r16: div(div(x,y),z) -> div(x,times(zero(y),z)) r17: eq(|0|(),|0|()) -> true() r18: eq(s(x),|0|()) -> false() r19: eq(|0|(),s(y)) -> false() r20: eq(s(x),s(y)) -> eq(x,y) r21: divides(y,x) -> eq(x,times(div(x,y),y)) r22: prime(s(s(x))) -> pr(s(s(x)),s(x)) r23: pr(x,s(|0|())) -> true() r24: pr(x,s(s(y))) -> if(divides(s(s(y)),x),x,s(y)) r25: if(true(),x,y) -> false() r26: if(false(),x,y) -> pr(x,y) r27: zero(div(x,x)) -> x r28: zero(divides(x,x)) -> x r29: zero(times(x,x)) -> x r30: zero(quot(x,x,x)) -> x r31: zero(s(x)) -> if(eq(x,s(|0|())),plus(zero(|0|()),|0|()),s(plus(|0|(),zero(|0|())))) 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!): matrix interpretation with standard point-wise order: carrier: N^1 order: standard order interpretations: eq#_A(x1,x2) = x1 + x2 s_A(x1) = x1 + 7 eq#!_A(x1,x2) = x1 + 21 s!_A(x1) = x1 + 20 2. marked-algebra reduction triple (>=A, >=A!, >A!): max/plus interpretation on natural numbers: eq#_A(x1,x2) = max{x1, x2} s_A(x1) = x1 + 184 eq#!_A(x1,x2) = max{7, x1 - 185, x2 - 185} s!_A(x1) = 6 partial status: pi(eq#) = [1, 2] pi(s) = [1] The following rules are removed: p1 Then no dependency pair remains.