MAYBE * Step 1: DependencyPairs MAYBE + Considered Problem: - Strict TRS: ge(x,0()) -> true() ge(0(),s(y)) -> false() ge(s(x),s(y)) -> ge(x,y) gen(x,y,z) -> if(ge(z,x),x,y,z) generate(x,y) -> gen(x,y,0()) if(false(),x,y,z) -> cons(y,gen(x,y,s(z))) if(true(),x,y,z) -> nil() sum(cons(0(),xs)) -> sum(xs) sum(cons(s(x),xs)) -> s(sum(cons(x,xs))) sum(nil()) -> 0() times(x,y) -> sum(generate(x,y)) - Signature: {ge/2,gen/3,generate/2,if/4,sum/1,times/2} / {0/0,cons/2,false/0,nil/0,s/1,true/0} - Obligation: innermost runtime complexity wrt. defined symbols {ge,gen,generate,if,sum,times} and constructors {0,cons ,false,nil,s,true} + Applied Processor: DependencyPairs {dpKind_ = DT} + Details: We add the following dependency tuples: Strict DPs ge#(x,0()) -> c_1() ge#(0(),s(y)) -> c_2() ge#(s(x),s(y)) -> c_3(ge#(x,y)) gen#(x,y,z) -> c_4(if#(ge(z,x),x,y,z),ge#(z,x)) generate#(x,y) -> c_5(gen#(x,y,0())) if#(false(),x,y,z) -> c_6(gen#(x,y,s(z))) if#(true(),x,y,z) -> c_7() sum#(cons(0(),xs)) -> c_8(sum#(xs)) sum#(cons(s(x),xs)) -> c_9(sum#(cons(x,xs))) sum#(nil()) -> c_10() times#(x,y) -> c_11(sum#(generate(x,y)),generate#(x,y)) Weak DPs and mark the set of starting terms. * Step 2: UsableRules MAYBE + Considered Problem: - Strict DPs: ge#(x,0()) -> c_1() ge#(0(),s(y)) -> c_2() ge#(s(x),s(y)) -> c_3(ge#(x,y)) gen#(x,y,z) -> c_4(if#(ge(z,x),x,y,z),ge#(z,x)) generate#(x,y) -> c_5(gen#(x,y,0())) if#(false(),x,y,z) -> c_6(gen#(x,y,s(z))) if#(true(),x,y,z) -> c_7() sum#(cons(0(),xs)) -> c_8(sum#(xs)) sum#(cons(s(x),xs)) -> c_9(sum#(cons(x,xs))) sum#(nil()) -> c_10() times#(x,y) -> c_11(sum#(generate(x,y)),generate#(x,y)) - Weak TRS: ge(x,0()) -> true() ge(0(),s(y)) -> false() ge(s(x),s(y)) -> ge(x,y) gen(x,y,z) -> if(ge(z,x),x,y,z) generate(x,y) -> gen(x,y,0()) if(false(),x,y,z) -> cons(y,gen(x,y,s(z))) if(true(),x,y,z) -> nil() sum(cons(0(),xs)) -> sum(xs) sum(cons(s(x),xs)) -> s(sum(cons(x,xs))) sum(nil()) -> 0() times(x,y) -> sum(generate(x,y)) - Signature: {ge/2,gen/3,generate/2,if/4,sum/1,times/2,ge#/2,gen#/3,generate#/2,if#/4,sum#/1,times#/2} / {0/0,cons/2 ,false/0,nil/0,s/1,true/0,c_1/0,c_2/0,c_3/1,c_4/2,c_5/1,c_6/1,c_7/0,c_8/1,c_9/1,c_10/0,c_11/2} - Obligation: innermost runtime complexity wrt. defined symbols {ge#,gen#,generate#,if#,sum#,times#} and constructors {0 ,cons,false,nil,s,true} + Applied Processor: UsableRules + Details: We replace rewrite rules by usable rules: ge(x,0()) -> true() ge(0(),s(y)) -> false() ge(s(x),s(y)) -> ge(x,y) gen(x,y,z) -> if(ge(z,x),x,y,z) generate(x,y) -> gen(x,y,0()) if(false(),x,y,z) -> cons(y,gen(x,y,s(z))) if(true(),x,y,z) -> nil() ge#(x,0()) -> c_1() ge#(0(),s(y)) -> c_2() ge#(s(x),s(y)) -> c_3(ge#(x,y)) gen#(x,y,z) -> c_4(if#(ge(z,x),x,y,z),ge#(z,x)) generate#(x,y) -> c_5(gen#(x,y,0())) if#(false(),x,y,z) -> c_6(gen#(x,y,s(z))) if#(true(),x,y,z) -> c_7() sum#(cons(0(),xs)) -> c_8(sum#(xs)) sum#(cons(s(x),xs)) -> c_9(sum#(cons(x,xs))) sum#(nil()) -> c_10() times#(x,y) -> c_11(sum#(generate(x,y)),generate#(x,y)) * Step 3: PredecessorEstimation MAYBE + Considered Problem: - Strict DPs: ge#(x,0()) -> c_1() ge#(0(),s(y)) -> c_2() ge#(s(x),s(y)) -> c_3(ge#(x,y)) gen#(x,y,z) -> c_4(if#(ge(z,x),x,y,z),ge#(z,x)) generate#(x,y) -> c_5(gen#(x,y,0())) if#(false(),x,y,z) -> c_6(gen#(x,y,s(z))) if#(true(),x,y,z) -> c_7() sum#(cons(0(),xs)) -> c_8(sum#(xs)) sum#(cons(s(x),xs)) -> c_9(sum#(cons(x,xs))) sum#(nil()) -> c_10() times#(x,y) -> c_11(sum#(generate(x,y)),generate#(x,y)) - Weak TRS: ge(x,0()) -> true() ge(0(),s(y)) -> false() ge(s(x),s(y)) -> ge(x,y) gen(x,y,z) -> if(ge(z,x),x,y,z) generate(x,y) -> gen(x,y,0()) if(false(),x,y,z) -> cons(y,gen(x,y,s(z))) if(true(),x,y,z) -> nil() - Signature: {ge/2,gen/3,generate/2,if/4,sum/1,times/2,ge#/2,gen#/3,generate#/2,if#/4,sum#/1,times#/2} / {0/0,cons/2 ,false/0,nil/0,s/1,true/0,c_1/0,c_2/0,c_3/1,c_4/2,c_5/1,c_6/1,c_7/0,c_8/1,c_9/1,c_10/0,c_11/2} - Obligation: innermost runtime complexity wrt. defined symbols {ge#,gen#,generate#,if#,sum#,times#} and constructors {0 ,cons,false,nil,s,true} + Applied Processor: PredecessorEstimation {onSelection = all simple predecessor estimation selector} + Details: We estimate the number of application of {1,2,7,10} by application of Pre({1,2,7,10}) = {3,4,8,11}. Here rules are labelled as follows: 1: ge#(x,0()) -> c_1() 2: ge#(0(),s(y)) -> c_2() 3: ge#(s(x),s(y)) -> c_3(ge#(x,y)) 4: gen#(x,y,z) -> c_4(if#(ge(z,x),x,y,z),ge#(z,x)) 5: generate#(x,y) -> c_5(gen#(x,y,0())) 6: if#(false(),x,y,z) -> c_6(gen#(x,y,s(z))) 7: if#(true(),x,y,z) -> c_7() 8: sum#(cons(0(),xs)) -> c_8(sum#(xs)) 9: sum#(cons(s(x),xs)) -> c_9(sum#(cons(x,xs))) 10: sum#(nil()) -> c_10() 11: times#(x,y) -> c_11(sum#(generate(x,y)),generate#(x,y)) * Step 4: RemoveWeakSuffixes MAYBE + Considered Problem: - Strict DPs: ge#(s(x),s(y)) -> c_3(ge#(x,y)) gen#(x,y,z) -> c_4(if#(ge(z,x),x,y,z),ge#(z,x)) generate#(x,y) -> c_5(gen#(x,y,0())) if#(false(),x,y,z) -> c_6(gen#(x,y,s(z))) sum#(cons(0(),xs)) -> c_8(sum#(xs)) sum#(cons(s(x),xs)) -> c_9(sum#(cons(x,xs))) times#(x,y) -> c_11(sum#(generate(x,y)),generate#(x,y)) - Weak DPs: ge#(x,0()) -> c_1() ge#(0(),s(y)) -> c_2() if#(true(),x,y,z) -> c_7() sum#(nil()) -> c_10() - Weak TRS: ge(x,0()) -> true() ge(0(),s(y)) -> false() ge(s(x),s(y)) -> ge(x,y) gen(x,y,z) -> if(ge(z,x),x,y,z) generate(x,y) -> gen(x,y,0()) if(false(),x,y,z) -> cons(y,gen(x,y,s(z))) if(true(),x,y,z) -> nil() - Signature: {ge/2,gen/3,generate/2,if/4,sum/1,times/2,ge#/2,gen#/3,generate#/2,if#/4,sum#/1,times#/2} / {0/0,cons/2 ,false/0,nil/0,s/1,true/0,c_1/0,c_2/0,c_3/1,c_4/2,c_5/1,c_6/1,c_7/0,c_8/1,c_9/1,c_10/0,c_11/2} - Obligation: innermost runtime complexity wrt. defined symbols {ge#,gen#,generate#,if#,sum#,times#} and constructors {0 ,cons,false,nil,s,true} + Applied Processor: RemoveWeakSuffixes + Details: Consider the dependency graph 1:S:ge#(s(x),s(y)) -> c_3(ge#(x,y)) -->_1 ge#(0(),s(y)) -> c_2():9 -->_1 ge#(x,0()) -> c_1():8 -->_1 ge#(s(x),s(y)) -> c_3(ge#(x,y)):1 2:S:gen#(x,y,z) -> c_4(if#(ge(z,x),x,y,z),ge#(z,x)) -->_1 if#(false(),x,y,z) -> c_6(gen#(x,y,s(z))):4 -->_1 if#(true(),x,y,z) -> c_7():10 -->_2 ge#(0(),s(y)) -> c_2():9 -->_2 ge#(x,0()) -> c_1():8 -->_2 ge#(s(x),s(y)) -> c_3(ge#(x,y)):1 3:S:generate#(x,y) -> c_5(gen#(x,y,0())) -->_1 gen#(x,y,z) -> c_4(if#(ge(z,x),x,y,z),ge#(z,x)):2 4:S:if#(false(),x,y,z) -> c_6(gen#(x,y,s(z))) -->_1 gen#(x,y,z) -> c_4(if#(ge(z,x),x,y,z),ge#(z,x)):2 5:S:sum#(cons(0(),xs)) -> c_8(sum#(xs)) -->_1 sum#(cons(s(x),xs)) -> c_9(sum#(cons(x,xs))):6 -->_1 sum#(nil()) -> c_10():11 -->_1 sum#(cons(0(),xs)) -> c_8(sum#(xs)):5 6:S:sum#(cons(s(x),xs)) -> c_9(sum#(cons(x,xs))) -->_1 sum#(cons(s(x),xs)) -> c_9(sum#(cons(x,xs))):6 -->_1 sum#(cons(0(),xs)) -> c_8(sum#(xs)):5 7:S:times#(x,y) -> c_11(sum#(generate(x,y)),generate#(x,y)) -->_1 sum#(nil()) -> c_10():11 -->_1 sum#(cons(s(x),xs)) -> c_9(sum#(cons(x,xs))):6 -->_1 sum#(cons(0(),xs)) -> c_8(sum#(xs)):5 -->_2 generate#(x,y) -> c_5(gen#(x,y,0())):3 8:W:ge#(x,0()) -> c_1() 9:W:ge#(0(),s(y)) -> c_2() 10:W:if#(true(),x,y,z) -> c_7() 11:W:sum#(nil()) -> c_10() The following weak DPs constitute a sub-graph of the DG that is closed under successors. The DPs are removed. 11: sum#(nil()) -> c_10() 10: if#(true(),x,y,z) -> c_7() 8: ge#(x,0()) -> c_1() 9: ge#(0(),s(y)) -> c_2() * Step 5: NaturalMI MAYBE + Considered Problem: - Strict DPs: ge#(s(x),s(y)) -> c_3(ge#(x,y)) gen#(x,y,z) -> c_4(if#(ge(z,x),x,y,z),ge#(z,x)) generate#(x,y) -> c_5(gen#(x,y,0())) if#(false(),x,y,z) -> c_6(gen#(x,y,s(z))) sum#(cons(0(),xs)) -> c_8(sum#(xs)) sum#(cons(s(x),xs)) -> c_9(sum#(cons(x,xs))) times#(x,y) -> c_11(sum#(generate(x,y)),generate#(x,y)) - Weak TRS: ge(x,0()) -> true() ge(0(),s(y)) -> false() ge(s(x),s(y)) -> ge(x,y) gen(x,y,z) -> if(ge(z,x),x,y,z) generate(x,y) -> gen(x,y,0()) if(false(),x,y,z) -> cons(y,gen(x,y,s(z))) if(true(),x,y,z) -> nil() - Signature: {ge/2,gen/3,generate/2,if/4,sum/1,times/2,ge#/2,gen#/3,generate#/2,if#/4,sum#/1,times#/2} / {0/0,cons/2 ,false/0,nil/0,s/1,true/0,c_1/0,c_2/0,c_3/1,c_4/2,c_5/1,c_6/1,c_7/0,c_8/1,c_9/1,c_10/0,c_11/2} - Obligation: innermost runtime complexity wrt. defined symbols {ge#,gen#,generate#,if#,sum#,times#} and constructors {0 ,cons,false,nil,s,true} + Applied Processor: NaturalMI {miDimension = 1, miDegree = 0, miKind = Algebraic, uargs = UArgs, urules = URules, selector = Just any strict-rules} + Details: We apply a matrix interpretation of kind constructor based matrix interpretation (containing no more than 0 non-zero interpretation-entries in the diagonal of the component-wise maxima): The following argument positions are considered usable: uargs(c_3) = {1}, uargs(c_4) = {1,2}, uargs(c_5) = {1}, uargs(c_6) = {1}, uargs(c_8) = {1}, uargs(c_9) = {1}, uargs(c_11) = {1,2} Following symbols are considered usable: {ge#,gen#,generate#,if#,sum#,times#} TcT has computed the following interpretation: p(0) = [3] p(cons) = [4] p(false) = [0] p(ge) = [2] x2 + [10] p(gen) = [2] x2 + [4] x3 + [2] p(generate) = [1] x2 + [1] p(if) = [2] x3 + [8] x4 + [0] p(nil) = [8] p(s) = [4] p(sum) = [1] x1 + [1] p(times) = [1] x1 + [1] x2 + [2] p(true) = [1] p(ge#) = [0] p(gen#) = [0] p(generate#) = [8] x1 + [8] x2 + [8] p(if#) = [0] p(sum#) = [0] p(times#) = [8] x1 + [8] x2 + [9] p(c_1) = [8] p(c_2) = [0] p(c_3) = [4] x1 + [0] p(c_4) = [1] x1 + [8] x2 + [0] p(c_5) = [1] x1 + [4] p(c_6) = [2] x1 + [0] p(c_7) = [2] p(c_8) = [4] x1 + [0] p(c_9) = [1] x1 + [0] p(c_10) = [1] p(c_11) = [2] x1 + [1] x2 + [1] Following rules are strictly oriented: generate#(x,y) = [8] x + [8] y + [8] > [4] = c_5(gen#(x,y,0())) Following rules are (at-least) weakly oriented: ge#(s(x),s(y)) = [0] >= [0] = c_3(ge#(x,y)) gen#(x,y,z) = [0] >= [0] = c_4(if#(ge(z,x),x,y,z),ge#(z,x)) if#(false(),x,y,z) = [0] >= [0] = c_6(gen#(x,y,s(z))) sum#(cons(0(),xs)) = [0] >= [0] = c_8(sum#(xs)) sum#(cons(s(x),xs)) = [0] >= [0] = c_9(sum#(cons(x,xs))) times#(x,y) = [8] x + [8] y + [9] >= [8] x + [8] y + [9] = c_11(sum#(generate(x,y)),generate#(x,y)) * Step 6: NaturalMI MAYBE + Considered Problem: - Strict DPs: ge#(s(x),s(y)) -> c_3(ge#(x,y)) gen#(x,y,z) -> c_4(if#(ge(z,x),x,y,z),ge#(z,x)) if#(false(),x,y,z) -> c_6(gen#(x,y,s(z))) sum#(cons(0(),xs)) -> c_8(sum#(xs)) sum#(cons(s(x),xs)) -> c_9(sum#(cons(x,xs))) times#(x,y) -> c_11(sum#(generate(x,y)),generate#(x,y)) - Weak DPs: generate#(x,y) -> c_5(gen#(x,y,0())) - Weak TRS: ge(x,0()) -> true() ge(0(),s(y)) -> false() ge(s(x),s(y)) -> ge(x,y) gen(x,y,z) -> if(ge(z,x),x,y,z) generate(x,y) -> gen(x,y,0()) if(false(),x,y,z) -> cons(y,gen(x,y,s(z))) if(true(),x,y,z) -> nil() - Signature: {ge/2,gen/3,generate/2,if/4,sum/1,times/2,ge#/2,gen#/3,generate#/2,if#/4,sum#/1,times#/2} / {0/0,cons/2 ,false/0,nil/0,s/1,true/0,c_1/0,c_2/0,c_3/1,c_4/2,c_5/1,c_6/1,c_7/0,c_8/1,c_9/1,c_10/0,c_11/2} - Obligation: innermost runtime complexity wrt. defined symbols {ge#,gen#,generate#,if#,sum#,times#} and constructors {0 ,cons,false,nil,s,true} + Applied Processor: NaturalMI {miDimension = 1, miDegree = 0, miKind = Algebraic, uargs = UArgs, urules = URules, selector = Just any strict-rules} + Details: We apply a matrix interpretation of kind constructor based matrix interpretation (containing no more than 0 non-zero interpretation-entries in the diagonal of the component-wise maxima): The following argument positions are considered usable: uargs(c_3) = {1}, uargs(c_4) = {1,2}, uargs(c_5) = {1}, uargs(c_6) = {1}, uargs(c_8) = {1}, uargs(c_9) = {1}, uargs(c_11) = {1,2} Following symbols are considered usable: {ge#,gen#,generate#,if#,sum#,times#} TcT has computed the following interpretation: p(0) = [8] p(cons) = [13] p(false) = [0] p(ge) = [0] p(gen) = [2] x3 + [2] p(generate) = [1] x1 + [4] x2 + [1] p(if) = [2] x1 + [8] x2 + [0] p(nil) = [1] p(s) = [0] p(sum) = [1] x1 + [1] p(times) = [1] x1 + [1] x2 + [1] p(true) = [0] p(ge#) = [0] p(gen#) = [0] p(generate#) = [3] x1 + [2] x2 + [0] p(if#) = [0] p(sum#) = [0] p(times#) = [12] x1 + [9] x2 + [13] p(c_1) = [0] p(c_2) = [1] p(c_3) = [2] x1 + [0] p(c_4) = [8] x1 + [1] x2 + [0] p(c_5) = [1] x1 + [0] p(c_6) = [8] x1 + [0] p(c_7) = [4] p(c_8) = [8] x1 + [0] p(c_9) = [1] x1 + [0] p(c_10) = [0] p(c_11) = [4] x1 + [4] x2 + [11] Following rules are strictly oriented: times#(x,y) = [12] x + [9] y + [13] > [12] x + [8] y + [11] = c_11(sum#(generate(x,y)),generate#(x,y)) Following rules are (at-least) weakly oriented: ge#(s(x),s(y)) = [0] >= [0] = c_3(ge#(x,y)) gen#(x,y,z) = [0] >= [0] = c_4(if#(ge(z,x),x,y,z),ge#(z,x)) generate#(x,y) = [3] x + [2] y + [0] >= [0] = c_5(gen#(x,y,0())) if#(false(),x,y,z) = [0] >= [0] = c_6(gen#(x,y,s(z))) sum#(cons(0(),xs)) = [0] >= [0] = c_8(sum#(xs)) sum#(cons(s(x),xs)) = [0] >= [0] = c_9(sum#(cons(x,xs))) * Step 7: Failure MAYBE + Considered Problem: - Strict DPs: ge#(s(x),s(y)) -> c_3(ge#(x,y)) gen#(x,y,z) -> c_4(if#(ge(z,x),x,y,z),ge#(z,x)) if#(false(),x,y,z) -> c_6(gen#(x,y,s(z))) sum#(cons(0(),xs)) -> c_8(sum#(xs)) sum#(cons(s(x),xs)) -> c_9(sum#(cons(x,xs))) - Weak DPs: generate#(x,y) -> c_5(gen#(x,y,0())) times#(x,y) -> c_11(sum#(generate(x,y)),generate#(x,y)) - Weak TRS: ge(x,0()) -> true() ge(0(),s(y)) -> false() ge(s(x),s(y)) -> ge(x,y) gen(x,y,z) -> if(ge(z,x),x,y,z) generate(x,y) -> gen(x,y,0()) if(false(),x,y,z) -> cons(y,gen(x,y,s(z))) if(true(),x,y,z) -> nil() - Signature: {ge/2,gen/3,generate/2,if/4,sum/1,times/2,ge#/2,gen#/3,generate#/2,if#/4,sum#/1,times#/2} / {0/0,cons/2 ,false/0,nil/0,s/1,true/0,c_1/0,c_2/0,c_3/1,c_4/2,c_5/1,c_6/1,c_7/0,c_8/1,c_9/1,c_10/0,c_11/2} - Obligation: innermost runtime complexity wrt. defined symbols {ge#,gen#,generate#,if#,sum#,times#} and constructors {0 ,cons,false,nil,s,true} + Applied Processor: EmptyProcessor + Details: The problem is still open. MAYBE