MAYBE * Step 1: DependencyPairs MAYBE + Considered Problem: - Strict TRS: and(x,false()) -> false() and(x,true()) -> x double(0()) -> 0() double(s(x)) -> s(s(double(x))) f(true(),x,y) -> f(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) gt(0(),v) -> false() gt(s(u),0()) -> true() gt(s(u),s(v)) -> gt(u,v) plus(n,0()) -> n plus(n,s(m)) -> s(plus(n,m)) - Signature: {and/2,double/1,f/3,gt/2,plus/2} / {0/0,false/0,s/1,true/0} - Obligation: innermost runtime complexity wrt. defined symbols {and,double,f,gt,plus} and constructors {0,false,s,true} + Applied Processor: DependencyPairs {dpKind_ = DT} + Details: We add the following dependency tuples: Strict DPs and#(x,false()) -> c_1() and#(x,true()) -> c_2() double#(0()) -> c_3() double#(s(x)) -> c_4(double#(x)) f#(true(),x,y) -> c_5(f#(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) ,and#(gt(x,y),gt(y,s(s(0())))) ,gt#(x,y) ,gt#(y,s(s(0()))) ,plus#(s(0()),x) ,double#(y)) gt#(0(),v) -> c_6() gt#(s(u),0()) -> c_7() gt#(s(u),s(v)) -> c_8(gt#(u,v)) plus#(n,0()) -> c_9() plus#(n,s(m)) -> c_10(plus#(n,m)) Weak DPs and mark the set of starting terms. * Step 2: UsableRules MAYBE + Considered Problem: - Strict DPs: and#(x,false()) -> c_1() and#(x,true()) -> c_2() double#(0()) -> c_3() double#(s(x)) -> c_4(double#(x)) f#(true(),x,y) -> c_5(f#(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) ,and#(gt(x,y),gt(y,s(s(0())))) ,gt#(x,y) ,gt#(y,s(s(0()))) ,plus#(s(0()),x) ,double#(y)) gt#(0(),v) -> c_6() gt#(s(u),0()) -> c_7() gt#(s(u),s(v)) -> c_8(gt#(u,v)) plus#(n,0()) -> c_9() plus#(n,s(m)) -> c_10(plus#(n,m)) - Weak TRS: and(x,false()) -> false() and(x,true()) -> x double(0()) -> 0() double(s(x)) -> s(s(double(x))) f(true(),x,y) -> f(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) gt(0(),v) -> false() gt(s(u),0()) -> true() gt(s(u),s(v)) -> gt(u,v) plus(n,0()) -> n plus(n,s(m)) -> s(plus(n,m)) - Signature: {and/2,double/1,f/3,gt/2,plus/2,and#/2,double#/1,f#/3,gt#/2,plus#/2} / {0/0,false/0,s/1,true/0,c_1/0,c_2/0 ,c_3/0,c_4/1,c_5/6,c_6/0,c_7/0,c_8/1,c_9/0,c_10/1} - Obligation: innermost runtime complexity wrt. defined symbols {and#,double#,f#,gt#,plus#} and constructors {0,false,s ,true} + Applied Processor: UsableRules + Details: We replace rewrite rules by usable rules: and(x,false()) -> false() and(x,true()) -> x double(0()) -> 0() double(s(x)) -> s(s(double(x))) gt(0(),v) -> false() gt(s(u),0()) -> true() gt(s(u),s(v)) -> gt(u,v) plus(n,0()) -> n plus(n,s(m)) -> s(plus(n,m)) and#(x,false()) -> c_1() and#(x,true()) -> c_2() double#(0()) -> c_3() double#(s(x)) -> c_4(double#(x)) f#(true(),x,y) -> c_5(f#(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) ,and#(gt(x,y),gt(y,s(s(0())))) ,gt#(x,y) ,gt#(y,s(s(0()))) ,plus#(s(0()),x) ,double#(y)) gt#(0(),v) -> c_6() gt#(s(u),0()) -> c_7() gt#(s(u),s(v)) -> c_8(gt#(u,v)) plus#(n,0()) -> c_9() plus#(n,s(m)) -> c_10(plus#(n,m)) * Step 3: PredecessorEstimation MAYBE + Considered Problem: - Strict DPs: and#(x,false()) -> c_1() and#(x,true()) -> c_2() double#(0()) -> c_3() double#(s(x)) -> c_4(double#(x)) f#(true(),x,y) -> c_5(f#(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) ,and#(gt(x,y),gt(y,s(s(0())))) ,gt#(x,y) ,gt#(y,s(s(0()))) ,plus#(s(0()),x) ,double#(y)) gt#(0(),v) -> c_6() gt#(s(u),0()) -> c_7() gt#(s(u),s(v)) -> c_8(gt#(u,v)) plus#(n,0()) -> c_9() plus#(n,s(m)) -> c_10(plus#(n,m)) - Weak TRS: and(x,false()) -> false() and(x,true()) -> x double(0()) -> 0() double(s(x)) -> s(s(double(x))) gt(0(),v) -> false() gt(s(u),0()) -> true() gt(s(u),s(v)) -> gt(u,v) plus(n,0()) -> n plus(n,s(m)) -> s(plus(n,m)) - Signature: {and/2,double/1,f/3,gt/2,plus/2,and#/2,double#/1,f#/3,gt#/2,plus#/2} / {0/0,false/0,s/1,true/0,c_1/0,c_2/0 ,c_3/0,c_4/1,c_5/6,c_6/0,c_7/0,c_8/1,c_9/0,c_10/1} - Obligation: innermost runtime complexity wrt. defined symbols {and#,double#,f#,gt#,plus#} and constructors {0,false,s ,true} + Applied Processor: PredecessorEstimation {onSelection = all simple predecessor estimation selector} + Details: We estimate the number of application of {1,2,3,6,7,9} by application of Pre({1,2,3,6,7,9}) = {4,5,8,10}. Here rules are labelled as follows: 1: and#(x,false()) -> c_1() 2: and#(x,true()) -> c_2() 3: double#(0()) -> c_3() 4: double#(s(x)) -> c_4(double#(x)) 5: f#(true(),x,y) -> c_5(f#(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) ,and#(gt(x,y),gt(y,s(s(0())))) ,gt#(x,y) ,gt#(y,s(s(0()))) ,plus#(s(0()),x) ,double#(y)) 6: gt#(0(),v) -> c_6() 7: gt#(s(u),0()) -> c_7() 8: gt#(s(u),s(v)) -> c_8(gt#(u,v)) 9: plus#(n,0()) -> c_9() 10: plus#(n,s(m)) -> c_10(plus#(n,m)) * Step 4: RemoveWeakSuffixes MAYBE + Considered Problem: - Strict DPs: double#(s(x)) -> c_4(double#(x)) f#(true(),x,y) -> c_5(f#(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) ,and#(gt(x,y),gt(y,s(s(0())))) ,gt#(x,y) ,gt#(y,s(s(0()))) ,plus#(s(0()),x) ,double#(y)) gt#(s(u),s(v)) -> c_8(gt#(u,v)) plus#(n,s(m)) -> c_10(plus#(n,m)) - Weak DPs: and#(x,false()) -> c_1() and#(x,true()) -> c_2() double#(0()) -> c_3() gt#(0(),v) -> c_6() gt#(s(u),0()) -> c_7() plus#(n,0()) -> c_9() - Weak TRS: and(x,false()) -> false() and(x,true()) -> x double(0()) -> 0() double(s(x)) -> s(s(double(x))) gt(0(),v) -> false() gt(s(u),0()) -> true() gt(s(u),s(v)) -> gt(u,v) plus(n,0()) -> n plus(n,s(m)) -> s(plus(n,m)) - Signature: {and/2,double/1,f/3,gt/2,plus/2,and#/2,double#/1,f#/3,gt#/2,plus#/2} / {0/0,false/0,s/1,true/0,c_1/0,c_2/0 ,c_3/0,c_4/1,c_5/6,c_6/0,c_7/0,c_8/1,c_9/0,c_10/1} - Obligation: innermost runtime complexity wrt. defined symbols {and#,double#,f#,gt#,plus#} and constructors {0,false,s ,true} + Applied Processor: RemoveWeakSuffixes + Details: Consider the dependency graph 1:S:double#(s(x)) -> c_4(double#(x)) -->_1 double#(0()) -> c_3():7 -->_1 double#(s(x)) -> c_4(double#(x)):1 2:S:f#(true(),x,y) -> c_5(f#(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) ,and#(gt(x,y),gt(y,s(s(0())))) ,gt#(x,y) ,gt#(y,s(s(0()))) ,plus#(s(0()),x) ,double#(y)) -->_5 plus#(n,s(m)) -> c_10(plus#(n,m)):4 -->_4 gt#(s(u),s(v)) -> c_8(gt#(u,v)):3 -->_3 gt#(s(u),s(v)) -> c_8(gt#(u,v)):3 -->_5 plus#(n,0()) -> c_9():10 -->_3 gt#(s(u),0()) -> c_7():9 -->_4 gt#(0(),v) -> c_6():8 -->_3 gt#(0(),v) -> c_6():8 -->_6 double#(0()) -> c_3():7 -->_2 and#(x,true()) -> c_2():6 -->_2 and#(x,false()) -> c_1():5 -->_1 f#(true(),x,y) -> c_5(f#(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) ,and#(gt(x,y),gt(y,s(s(0())))) ,gt#(x,y) ,gt#(y,s(s(0()))) ,plus#(s(0()),x) ,double#(y)):2 -->_6 double#(s(x)) -> c_4(double#(x)):1 3:S:gt#(s(u),s(v)) -> c_8(gt#(u,v)) -->_1 gt#(s(u),0()) -> c_7():9 -->_1 gt#(0(),v) -> c_6():8 -->_1 gt#(s(u),s(v)) -> c_8(gt#(u,v)):3 4:S:plus#(n,s(m)) -> c_10(plus#(n,m)) -->_1 plus#(n,0()) -> c_9():10 -->_1 plus#(n,s(m)) -> c_10(plus#(n,m)):4 5:W:and#(x,false()) -> c_1() 6:W:and#(x,true()) -> c_2() 7:W:double#(0()) -> c_3() 8:W:gt#(0(),v) -> c_6() 9:W:gt#(s(u),0()) -> c_7() 10:W:plus#(n,0()) -> c_9() The following weak DPs constitute a sub-graph of the DG that is closed under successors. The DPs are removed. 5: and#(x,false()) -> c_1() 6: and#(x,true()) -> c_2() 8: gt#(0(),v) -> c_6() 9: gt#(s(u),0()) -> c_7() 10: plus#(n,0()) -> c_9() 7: double#(0()) -> c_3() * Step 5: SimplifyRHS MAYBE + Considered Problem: - Strict DPs: double#(s(x)) -> c_4(double#(x)) f#(true(),x,y) -> c_5(f#(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) ,and#(gt(x,y),gt(y,s(s(0())))) ,gt#(x,y) ,gt#(y,s(s(0()))) ,plus#(s(0()),x) ,double#(y)) gt#(s(u),s(v)) -> c_8(gt#(u,v)) plus#(n,s(m)) -> c_10(plus#(n,m)) - Weak TRS: and(x,false()) -> false() and(x,true()) -> x double(0()) -> 0() double(s(x)) -> s(s(double(x))) gt(0(),v) -> false() gt(s(u),0()) -> true() gt(s(u),s(v)) -> gt(u,v) plus(n,0()) -> n plus(n,s(m)) -> s(plus(n,m)) - Signature: {and/2,double/1,f/3,gt/2,plus/2,and#/2,double#/1,f#/3,gt#/2,plus#/2} / {0/0,false/0,s/1,true/0,c_1/0,c_2/0 ,c_3/0,c_4/1,c_5/6,c_6/0,c_7/0,c_8/1,c_9/0,c_10/1} - Obligation: innermost runtime complexity wrt. defined symbols {and#,double#,f#,gt#,plus#} and constructors {0,false,s ,true} + Applied Processor: SimplifyRHS + Details: Consider the dependency graph 1:S:double#(s(x)) -> c_4(double#(x)) -->_1 double#(s(x)) -> c_4(double#(x)):1 2:S:f#(true(),x,y) -> c_5(f#(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) ,and#(gt(x,y),gt(y,s(s(0())))) ,gt#(x,y) ,gt#(y,s(s(0()))) ,plus#(s(0()),x) ,double#(y)) -->_5 plus#(n,s(m)) -> c_10(plus#(n,m)):4 -->_4 gt#(s(u),s(v)) -> c_8(gt#(u,v)):3 -->_3 gt#(s(u),s(v)) -> c_8(gt#(u,v)):3 -->_1 f#(true(),x,y) -> c_5(f#(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) ,and#(gt(x,y),gt(y,s(s(0())))) ,gt#(x,y) ,gt#(y,s(s(0()))) ,plus#(s(0()),x) ,double#(y)):2 -->_6 double#(s(x)) -> c_4(double#(x)):1 3:S:gt#(s(u),s(v)) -> c_8(gt#(u,v)) -->_1 gt#(s(u),s(v)) -> c_8(gt#(u,v)):3 4:S:plus#(n,s(m)) -> c_10(plus#(n,m)) -->_1 plus#(n,s(m)) -> c_10(plus#(n,m)):4 Due to missing edges in the depndency graph, the right-hand sides of following rules could be simplified: f#(true(),x,y) -> c_5(f#(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) ,gt#(x,y) ,gt#(y,s(s(0()))) ,plus#(s(0()),x) ,double#(y)) * Step 6: Failure MAYBE + Considered Problem: - Strict DPs: double#(s(x)) -> c_4(double#(x)) f#(true(),x,y) -> c_5(f#(and(gt(x,y),gt(y,s(s(0())))),plus(s(0()),x),double(y)) ,gt#(x,y) ,gt#(y,s(s(0()))) ,plus#(s(0()),x) ,double#(y)) gt#(s(u),s(v)) -> c_8(gt#(u,v)) plus#(n,s(m)) -> c_10(plus#(n,m)) - Weak TRS: and(x,false()) -> false() and(x,true()) -> x double(0()) -> 0() double(s(x)) -> s(s(double(x))) gt(0(),v) -> false() gt(s(u),0()) -> true() gt(s(u),s(v)) -> gt(u,v) plus(n,0()) -> n plus(n,s(m)) -> s(plus(n,m)) - Signature: {and/2,double/1,f/3,gt/2,plus/2,and#/2,double#/1,f#/3,gt#/2,plus#/2} / {0/0,false/0,s/1,true/0,c_1/0,c_2/0 ,c_3/0,c_4/1,c_5/5,c_6/0,c_7/0,c_8/1,c_9/0,c_10/1} - Obligation: innermost runtime complexity wrt. defined symbols {and#,double#,f#,gt#,plus#} and constructors {0,false,s ,true} + Applied Processor: EmptyProcessor + Details: The problem is still open. MAYBE