YES
(ignored inputs)COMMENT R7 of \cite{AT2012}
Rewrite Rules:
   [ +(?x,0) -> ?x,
     +(?x,s(?y)) -> s(+(?x,?y)),
     +(0,?y) -> ?y,
     +(s(?x),?y) -> s(+(?x,?y)),
     dbl(?x) -> +(?x,?x),
     +(+(?x,?y),?z) -> +(?x,+(?y,?z)),
     +(?x,?y) -> +(?y,?x),
     s(?x) -> s(s(?x)),
     s(s(?x)) -> s(?x) ]
Apply Direct Methods...
Inner CPs:
   [ +(?x_1,s(s(?x_7))) = s(+(?x_1,?x_7)),
     +(?x_1,s(?x_8)) = s(+(?x_1,s(?x_8))),
     +(s(s(?x_7)),?y_3) = s(+(?x_7,?y_3)),
     +(s(?x_8),?y_3) = s(+(s(?x_8),?y_3)),
     +(?x,?z_5) = +(?x,+(0,?z_5)),
     +(s(+(?x_1,?y_1)),?z_5) = +(?x_1,+(s(?y_1),?z_5)),
     +(?y_2,?z_5) = +(0,+(?y_2,?z_5)),
     +(s(+(?x_3,?y_3)),?z_5) = +(s(?x_3),+(?y_3,?z_5)),
     +(+(?y_6,?x_6),?z_5) = +(?x_6,+(?y_6,?z_5)),
     s(s(s(?x_7))) = s(?x_7),
     +(+(?x,+(?y,?z)),?z_1) = +(+(?x,?y),+(?z,?z_1)),
     s(s(?x)) = s(s(?x)) ]
Outer CPs:
   [ 0 = 0,
     s(?x_3) = s(+(?x_3,0)),
     +(?x_5,?y_5) = +(?x_5,+(?y_5,0)),
     ?x = +(0,?x),
     s(+(0,?y_1)) = s(?y_1),
     s(+(s(?x_3),?y_1)) = s(+(?x_3,s(?y_1))),
     s(+(+(?x_5,?y_5),?y_1)) = +(?x_5,+(?y_5,s(?y_1))),
     s(+(?x_1,?y_1)) = +(s(?y_1),?x_1),
     ?y_2 = +(?y_2,0),
     s(+(?x_3,?y_3)) = +(?y_3,s(?x_3)),
     +(?x_5,+(?y_5,?z_5)) = +(?z_5,+(?x_5,?y_5)),
     s(s(s(?x_8))) = s(?x_8) ]
not Overlay, check Termination...
unknown/not Terminating
unknown Knuth & Bendix
Left-Linear, not Right-Linear
unknown Development Closed
unknown Weakly-Non-Overlapping & Non-Collapsing & Shallow
unknown Upside-Parallel-Closed/Outside-Closed
(inner) Parallel CPs: (not computed)
unknown Toyama (Parallel CPs)
Simultaneous CPs:
   [ 0 = 0,
     s(+(?x_3,0)) = s(?x_3),
     +(?x_5,+(?y_5,0)) = +(?x_5,?y_5),
     +(0,?x) = ?x,
     +(?x,+(0,?z_6)) = +(?x,?z_6),
     s(s(?y)) = s(+(0,?y)),
     s(?x_9) = s(+(0,s(?x_9))),
     s(+(?x_3,s(s(?y)))) = s(+(s(?x_3),?y)),
     s(+(?x_3,s(?x_12))) = s(+(s(?x_3),s(?x_12))),
     +(?x_5,+(?y_5,s(s(?y)))) = s(+(+(?x_5,?y_5),?y)),
     +(?x_5,+(?y_5,s(?x_14))) = s(+(+(?x_5,?y_5),s(?x_14))),
     +(s(s(?y)),?x) = s(+(?x,?y)),
     +(s(?x_9),?x) = s(+(?x,s(?x_9))),
     s(?y) = s(+(0,?y)),
     s(+(?x_3,s(?y))) = s(+(s(?x_3),?y)),
     +(?x_5,+(?y_5,s(?y))) = s(+(+(?x_5,?y_5),?y)),
     +(s(?y),?x) = s(+(?x,?y)),
     +(?x,s(s(?y))) = s(+(?x,?y)),
     +(?x,s(?x_9)) = s(+(?x,s(?x_9))),
     +(?x,+(s(s(?y)),?z_6)) = +(s(+(?x,?y)),?z_6),
     +(?x,+(s(?x_15),?z_6)) = +(s(+(?x,s(?x_15))),?z_6),
     +(?x,+(s(?y),?z_6)) = +(s(+(?x,?y)),?z_6),
     s(+(0,?y_2)) = s(?y_2),
     +(?y,0) = ?y,
     +(0,+(?y,?z_6)) = +(?y,?z_6),
     s(s(?x)) = s(+(?x,0)),
     s(?x_9) = s(+(s(?x_9),0)),
     s(+(s(s(?x)),?y_2)) = s(+(?x,s(?y_2))),
     s(+(s(?x_11),?y_2)) = s(+(s(?x_11),s(?y_2))),
     +(?y,s(s(?x))) = s(+(?x,?y)),
     +(?y,s(?x_9)) = s(+(s(?x_9),?y)),
     s(?x) = s(+(?x,0)),
     s(+(s(?x),?y_2)) = s(+(?x,s(?y_2))),
     +(?y,s(?x)) = s(+(?x,?y)),
     +(s(s(?x)),?y) = s(+(?x,?y)),
     +(s(?x_9),?y) = s(+(s(?x_9),?y)),
     +(s(s(?x)),+(?y,?z_6)) = +(s(+(?x,?y)),?z_6),
     +(s(?x_15),+(?y,?z_6)) = +(s(+(s(?x_15),?y)),?z_6),
     +(s(?x),+(?y,?z_6)) = +(s(+(?x,?y)),?z_6),
     +(?x_1,+(?y_1,?y)) = +(+(?x_1,?y_1),+(?y,0)),
     ?x = +(?x,+(0,0)),
     s(+(?x,?y_3)) = +(?x,+(s(?y_3),0)),
     ?y = +(0,+(?y,0)),
     s(+(?x_5,?y)) = +(s(?x_5),+(?y,0)),
     +(?y,?x) = +(?x,+(?y,0)),
     s(+(+(?x_3,+(?y_3,?y)),?y_2)) = +(+(?x_3,?y_3),+(?y,s(?y_2))),
     s(+(?x,?y_2)) = +(?x,+(0,s(?y_2))),
     s(+(s(+(?x,?y_5)),?y_2)) = +(?x,+(s(?y_5),s(?y_2))),
     s(+(?y,?y_2)) = +(0,+(?y,s(?y_2))),
     s(+(s(+(?x_7,?y)),?y_2)) = +(s(?x_7),+(?y,s(?y_2))),
     s(+(+(?y,?x),?y_2)) = +(?x,+(?y,s(?y_2))),
     +(?z,+(?x_1,+(?y_1,?y))) = +(+(?x_1,?y_1),+(?y,?z)),
     +(?z,?x) = +(?x,+(0,?z)),
     +(?z,s(+(?x,?y_3))) = +(?x,+(s(?y_3),?z)),
     +(?z,?y) = +(0,+(?y,?z)),
     +(?z,s(+(?x_5,?y))) = +(s(?x_5),+(?y,?z)),
     +(?z,+(?y,?x)) = +(?x,+(?y,?z)),
     +(?x,?y) = +(?x,+(?y,0)),
     s(+(+(?x,?y),?y_2)) = +(?x,+(?y,s(?y_2))),
     +(?z,+(?x,?y)) = +(?x,+(?y,?z)),
     +(+(?x_1,+(?y_1,?y)),?z) = +(+(?x_1,?y_1),+(?y,?z)),
     +(?x,?z) = +(?x,+(0,?z)),
     +(s(+(?x,?y_3)),?z) = +(?x,+(s(?y_3),?z)),
     +(?y,?z) = +(0,+(?y,?z)),
     +(s(+(?x_5,?y)),?z) = +(s(?x_5),+(?y,?z)),
     +(+(?y,?x),?z) = +(?x,+(?y,?z)),
     +(+(?x_2,+(?y_2,?y)),+(?z,?z_1)) = +(+(+(?x_2,?y_2),+(?y,?z)),?z_1),
     +(?x,+(?z,?z_1)) = +(+(?x,+(0,?z)),?z_1),
     +(s(+(?x,?y_4)),+(?z,?z_1)) = +(+(?x,+(s(?y_4),?z)),?z_1),
     +(?y,+(?z,?z_1)) = +(+(0,+(?y,?z)),?z_1),
     +(s(+(?x_6,?y)),+(?z,?z_1)) = +(+(s(?x_6),+(?y,?z)),?z_1),
     +(+(?y,?x),+(?z,?z_1)) = +(+(?x,+(?y,?z)),?z_1),
     +(+(?x,?y),+(?z,?z_1)) = +(+(?x,+(?y,?z)),?z_1),
     ?x = +(0,?x),
     s(+(?x,?y_2)) = +(s(?y_2),?x),
     ?y = +(?y,0),
     s(+(?x_4,?y)) = +(?y,s(?x_4)),
     +(?x_6,+(?y_6,?y)) = +(?y,+(?x_6,?y_6)),
     +(?x,+(?y,?z_7)) = +(+(?y,?x),?z_7),
     s(?x_8) = s(s(s(?x_8))),
     s(+(?x_3,?x)) = +(?x_3,s(s(?x))),
     s(+(?x,?y_5)) = +(s(s(?x)),?y_5),
     s(s(s(?x_1))) = s(s(?x_1)),
     s(s(s(s(?x)))) = s(?x),
     s(s(s(?x))) = s(?x),
     s(s(?x_1)) = s(s(?x_1)),
     s(s(?x_1)) = s(s(s(?x_1))),
     s(+(?x_3,s(?x_4))) = +(?x_3,s(s(?x_4))),
     s(+(?x_3,s(s(?x)))) = +(?x_3,s(?x)),
     s(+(s(?x_6),?y_5)) = +(s(s(?x_6)),?y_5),
     s(+(s(s(?x)),?y_5)) = +(s(?x),?y_5),
     s(+(?x_3,s(?x))) = +(?x_3,s(?x)),
     s(+(s(?x),?y_5)) = +(s(?x),?y_5) ]
unknown Okui (Simultaneous CPs)
unknown Strongly Depth-Preserving & Root-E-Closed/Non-E-Overlapping
unknown Strongly Weight-Preserving & Root-E-Closed/Non-E-Overlapping
check Locally Decreasing Diagrams by Rule Labelling...
Critical Pair <+(?x_1,s(s(?x_7))), s(+(?x_1,?x_7))> by Rules <7, 1> preceded by [(+,2)]
 joinable by a reduction of rules <[([(+,2)],8),([],1)], []>
 joinable by a reduction of rules <[([],1),([(s,1)],1)], [([],7)]>
Critical Pair <+(?x_1,s(?x_8)), s(+(?x_1,s(?x_8)))> by Rules <8, 1> preceded by [(+,2)]
 joinable by a reduction of rules <[([(+,2)],7),([],1)], []>
 joinable by a reduction of rules <[([],1),([],7)], [([(s,1)],1)]>
 joinable by a reduction of rules <[([],1)], [([(s,1)],1),([],8)]>
Critical Pair <+(s(s(?x_7)),?y_3), s(+(?x_7,?y_3))> by Rules <7, 3> preceded by [(+,1)]
 joinable by a reduction of rules <[([(+,1)],8),([],3)], []>
 joinable by a reduction of rules <[([],3),([(s,1)],3)], [([],7)]>
Critical Pair <+(s(?x_8),?y_3), s(+(s(?x_8),?y_3))> by Rules <8, 3> preceded by [(+,1)]
 joinable by a reduction of rules <[([(+,1)],7),([],3)], []>
 joinable by a reduction of rules <[([],3),([],7)], [([(s,1)],3)]>
 joinable by a reduction of rules <[([],3)], [([(s,1)],3),([],8)]>
Critical Pair <+(?x,?z_5), +(?x,+(0,?z_5))> by Rules <0, 5> preceded by [(+,1)]
 joinable by a reduction of rules <[], [([(+,2)],2)]>
Critical Pair <+(s(+(?x_1,?y_1)),?z_5), +(?x_1,+(s(?y_1),?z_5))> by Rules <1, 5> preceded by [(+,1)]
 joinable by a reduction of rules <[([],3),([(s,1)],5)], [([(+,2)],3),([],1)]>
Critical Pair <+(?y_2,?z_5), +(0,+(?y_2,?z_5))> by Rules <2, 5> preceded by [(+,1)]
 joinable by a reduction of rules <[], [([],2)]>
Critical Pair <+(s(+(?x_3,?y_3)),?z_5), +(s(?x_3),+(?y_3,?z_5))> by Rules <3, 5> preceded by [(+,1)]
 joinable by a reduction of rules <[([],3),([(s,1)],5)], [([],3)]>
Critical Pair <+(+(?y_6,?x_6),?z_5), +(?x_6,+(?y_6,?z_5))> by Rules <6, 5> preceded by [(+,1)]
 joinable by a reduction of rules <[([(+,1)],6),([],5)], []>
 joinable by a reduction of rules <[([],5),([(+,2)],6)], [([],6),([],5)]>
Critical Pair <s(s(s(?x_7))), s(?x_7)> by Rules <7, 8> preceded by [(s,1)]
 joinable by a reduction of rules <[([(s,1)],8)], [([],7)]>
 joinable by a reduction of rules <[([],8)], [([],7)]>
Critical Pair <+(+(?x,+(?y,?z)),?z_1), +(+(?x,?y),+(?z,?z_1))> by Rules <5, 5> preceded by [(+,1)]
 joinable by a reduction of rules <[([],5),([(+,2)],5)], [([],5)]>
Critical Pair <s(s(?x)), s(s(?x))> by Rules <8, 8> preceded by [(s,1)]
 joinable by a reduction of rules <[], []>
Critical Pair <0, 0> by Rules <2, 0> preceded by []
 joinable by a reduction of rules <[], []>
Critical Pair <s(+(?x_3,0)), s(?x_3)> by Rules <3, 0> preceded by []
 joinable by a reduction of rules <[([(s,1)],0)], []>
Critical Pair <+(?x_5,+(?y_5,0)), +(?x_5,?y_5)> by Rules <5, 0> preceded by []
 joinable by a reduction of rules <[([(+,2)],0)], []>
Critical Pair <+(0,?x_6), ?x_6> by Rules <6, 0> preceded by []
 joinable by a reduction of rules <[([],2)], []>
Critical Pair <s(?y_1), s(+(0,?y_1))> by Rules <2, 1> preceded by []
 joinable by a reduction of rules <[], [([(s,1)],2)]>
Critical Pair <s(+(?x_3,s(?y_1))), s(+(s(?x_3),?y_1))> by Rules <3, 1> preceded by []
 joinable by a reduction of rules <[([(s,1)],1)], [([(s,1)],3)]>
Critical Pair <+(?x_5,+(?y_5,s(?y_1))), s(+(+(?x_5,?y_5),?y_1))> by Rules <5, 1> preceded by []
 joinable by a reduction of rules <[([(+,2)],1),([],1)], [([(s,1)],5)]>
Critical Pair <+(s(?y_1),?x_6), s(+(?x_6,?y_1))> by Rules <6, 1> preceded by []
 joinable by a reduction of rules <[([],3)], [([(s,1)],6)]>
Critical Pair <+(?y_6,0), ?y_6> by Rules <6, 2> preceded by []
 joinable by a reduction of rules <[([],0)], []>
Critical Pair <+(?y_6,s(?x_3)), s(+(?x_3,?y_6))> by Rules <6, 3> preceded by []
 joinable by a reduction of rules <[([],1)], [([(s,1)],6)]>
Critical Pair <+(?y_6,+(?x_5,?y_5)), +(?x_5,+(?y_5,?y_6))> by Rules <6, 5> preceded by []
 joinable by a reduction of rules <[([],6),([],5)], []>
Critical Pair <s(?x_8), s(s(s(?x_8)))> by Rules <8, 7> preceded by []
 joinable by a reduction of rules <[([],7)], [([(s,1)],8)]>
 joinable by a reduction of rules <[([],7)], [([],8)]>
unknown Diagram Decreasing
   [ +(?x,0) -> ?x,
     +(?x_1,s(?y_1)) -> s(+(?x_1,?y_1)),
     +(0,?y_2) -> ?y_2,
     +(s(?x_3),?y_3) -> s(+(?x_3,?y_3)),
     dbl(?x_4) -> +(?x_4,?x_4),
     +(+(?x_5,?y_5),?z_5) -> +(?x_5,+(?y_5,?z_5)),
     +(?x_6,?y_6) -> +(?y_6,?x_6),
     s(?x_7) -> s(s(?x_7)),
     s(s(?x_8)) -> s(?x_8) ]
Sort Assignment:
 + : 23*23=>23
 0 : =>23
 s : 23=>23
 dbl : 23=>23
non-linear variables: {?x_4}
non-linear types: {23}
types leq non-linear types: {23}
rules applicable to terms of non-linear types:
   [ +(?x,0) -> ?x,
     +(?x_1,s(?y_1)) -> s(+(?x_1,?y_1)),
     +(0,?y_2) -> ?y_2,
     +(s(?x_3),?y_3) -> s(+(?x_3,?y_3)),
     dbl(?x_4) -> +(?x_4,?x_4),
     +(+(?x_5,?y_5),?z_5) -> +(?x_5,+(?y_5,?z_5)),
     +(?x_6,?y_6) -> +(?y_6,?x_6),
     s(?x_7) -> s(s(?x_7)),
     s(s(?x_8)) -> s(?x_8) ]
NLR:
0: {}
1: {}
2: {}
3: {}
4: {0,1,2,3,4,5,6,7,8}
5: {}
6: {}
7: {}
8: {}
unknown innermost-termination for terms of non-linear types
unknown Quasi-Linear & Linearized-Decreasing
   [ +(?x,0) -> ?x,
     +(?x_1,s(?y_1)) -> s(+(?x_1,?y_1)),
     +(0,?y_2) -> ?y_2,
     +(s(?x_3),?y_3) -> s(+(?x_3,?y_3)),
     dbl(?x_4) -> +(?x_4,?x_4),
     +(+(?x_5,?y_5),?z_5) -> +(?x_5,+(?y_5,?z_5)),
     +(?x_6,?y_6) -> +(?y_6,?x_6),
     s(?x_7) -> s(s(?x_7)),
     s(s(?x_8)) -> s(?x_8) ]
Sort Assignment:
 + : 23*23=>23
 0 : =>23
 s : 23=>23
 dbl : 23=>23
non-linear variables: {?x_4}
non-linear types: {23}
types leq non-linear types: {23}
rules applicable to terms of non-linear types:
   [ +(?x,0) -> ?x,
     +(?x_1,s(?y_1)) -> s(+(?x_1,?y_1)),
     +(0,?y_2) -> ?y_2,
     +(s(?x_3),?y_3) -> s(+(?x_3,?y_3)),
     dbl(?x_4) -> +(?x_4,?x_4),
     +(+(?x_5,?y_5),?z_5) -> +(?x_5,+(?y_5,?z_5)),
     +(?x_6,?y_6) -> +(?y_6,?x_6),
     s(?x_7) -> s(s(?x_7)),
     s(s(?x_8)) -> s(?x_8) ]
unknown innermost-termination for terms of non-linear types
unknown Strongly Quasi-Linear & Hierarchically Decreasing
check Non-Confluence...
obtain 19 rules by 3 steps unfolding
strenghten dbl(0) and 0
strenghten +(?x_12,0) and ?x_12
strenghten +(0,?x_6) and ?x_6
strenghten +(0,0) and 0
strenghten s(s(?x_8)) and s(?x_8)
strenghten dbl(+(0,0)) and 0
strenghten s(+(?x_3,0)) and s(?x_3)
strenghten s(+(0,?y_1)) and s(?y_1)
strenghten s(s(s(?x_7))) and s(?x_7)
strenghten +(dbl(0),dbl(0)) and 0
strenghten s(+(?x_1,?x_9)) and +(?x_1,s(?x_9))
strenghten s(+(?x_3,?y_6)) and +(?y_6,s(?x_3))
strenghten s(+(?x_6,?y_1)) and +(s(?y_1),?x_6)
strenghten s(+(?x_9,?y_3)) and +(s(?x_9),?y_3)
strenghten +(?x,+(0,?z_5)) and +(?x,?z_5)
strenghten +(?x_5,+(?y_5,0)) and +(?x_5,?y_5)
strenghten +(0,+(?x_12,?z_5)) and +(?x_12,?z_5)
strenghten +(?x_1,s(s(?x_7))) and s(+(?x_1,?x_7))
strenghten +(s(s(?x_7)),?y_3) and s(+(?x_7,?y_3))
strenghten s(+(?x_1,s(?x_8))) and +(?x_1,s(?x_8))
strenghten s(+(s(?x_8),?y_3)) and +(s(?x_8),?y_3)
strenghten +(?x_5,+(?y_5,?y_6)) and +(?y_6,+(?x_5,?y_5))
obtain 100 candidates for checking non-joinability
check by TCAP-Approximation (failure)
check by Root-Approximation (failure)
check by Ordering(rpo), check by Tree-Automata Approximation (failure)
check by Interpretation(mod2) (failure)
check by Descendants-Approximation, check by Ordering(poly) (failure)
unknown Non-Confluence
Check relative termination:
   [ +(?x,0) -> ?x,
     +(?x,s(?y)) -> s(+(?x,?y)),
     +(0,?y) -> ?y,
     +(s(?x),?y) -> s(+(?x,?y)),
     dbl(?x) -> +(?x,?x),
     s(?x) -> s(s(?x)),
     s(s(?x)) -> s(?x) ]
   [ +(+(?x,?y),?z) -> +(?x,+(?y,?z)),
     +(?x,?y) -> +(?y,?x) ]
not relatively terminatiing
unknown Huet (modulo AC)
check by Reduction-Preserving Completion...
STEP: 1 (parallel)
S:
   [ +(?x,0) -> ?x,
     +(?x,s(?y)) -> s(+(?x,?y)),
     +(0,?y) -> ?y,
     +(s(?x),?y) -> s(+(?x,?y)),
     dbl(?x) -> +(?x,?x) ]
P:
   [ +(+(?x,?y),?z) -> +(?x,+(?y,?z)),
     +(?x,?y) -> +(?y,?x),
     s(?x) -> s(s(?x)),
     s(s(?x)) -> s(?x) ]
S: terminating
CP(S,S):
<0, 0> --> <0, 0> => yes
<s(+(?x_3,0)), s(?x_3)> --> <s(?x_3), s(?x_3)> => yes
<s(?y_1), s(+(0,?y_1))> --> <s(?y_1), s(?y_1)> => yes
<s(+(?x_3,s(?y_1))), s(+(s(?x_3),?y_1))> --> <s(s(+(?x_3,?y_1))), s(s(+(?x_3,?y_1)))> => yes
PCP_in(symP,S):
<+(?x,s(s(?x_5))), s(+(?x,?x_5))> --> <s(s(+(?x,?x_5))), s(+(?x,?x_5))> => no
<+(?x,s(?x_4)), s(+(?x,s(?x_4)))> --> <s(+(?x,?x_4)), s(s(+(?x,?x_4)))> => no
<+(s(s(?x_5)),?y), s(+(?x_5,?y))> --> <s(s(+(?x_5,?y))), s(+(?x_5,?y))> => no
<+(s(?x_4),?y), s(+(s(?x_4),?y))> --> <s(+(?x_4,?y)), s(s(+(?x_4,?y)))> => no
CP(S,symP):
<+(?x_1,?y_1), +(?x_1,+(?y_1,0))> --> <+(?x_1,?y_1), +(?x_1,?y_1)> => yes
<+(?x,?z_1), +(?x,+(0,?z_1))> --> <+(?x,?z_1), +(?x,?z_1)> => yes
<+(?x_1,?x), +(+(?x_1,?x),0)> --> <+(?x_1,?x), +(?x_1,?x)> => yes
<?x, +(0,?x)> --> <?x, ?x> => yes
<s(+(+(?x_1,?y_1),?y)), +(?x_1,+(?y_1,s(?y)))> --> <s(+(+(?x_1,?y_1),?y)), s(+(?x_1,+(?y_1,?y)))> => yes
<+(s(+(?x,?y)),?z_1), +(?x,+(s(?y),?z_1))> --> <s(+(+(?x,?y),?z_1)), s(+(?x,+(?y,?z_1)))> => yes
<+(?x_1,s(+(?x,?y))), +(+(?x_1,?x),s(?y))> --> <s(+(?x_1,+(?x,?y))), s(+(+(?x_1,?x),?y))> => yes
<s(+(?x,?y)), +(s(?y),?x)> --> <s(+(?x,?y)), s(+(?y,?x))> => yes
<+(?y,?z_1), +(0,+(?y,?z_1))> --> <+(?y,?z_1), +(?y,?z_1)> => yes
<+(?y_1,?z_1), +(+(0,?y_1),?z_1)> --> <+(?y_1,?z_1), +(?y_1,?z_1)> => yes
<+(?x_1,?y), +(+(?x_1,0),?y)> --> <+(?x_1,?y), +(?x_1,?y)> => yes
<?y, +(?y,0)> --> <?y, ?y> => yes
<+(s(+(?x,?y)),?z_1), +(s(?x),+(?y,?z_1))> --> <s(+(+(?x,?y),?z_1)), s(+(?x,+(?y,?z_1)))> => yes
<s(+(?x,+(?y_1,?z_1))), +(+(s(?x),?y_1),?z_1)> --> <s(+(?x,+(?y_1,?z_1))), s(+(+(?x,?y_1),?z_1))> => yes
<+(?x_1,s(+(?x,?y))), +(+(?x_1,s(?x)),?y)> --> <s(+(?x_1,+(?x,?y))), s(+(+(?x_1,?x),?y))> => yes
<s(+(?x,?y)), +(?y,s(?x))> --> <s(+(?x,?y)), s(+(?y,?x))> => yes
check joinability condition:
check modulo joinability of s(s(+(?x,?x_5))) and s(+(?x,?x_5)): joinable by {0}
check modulo joinability of s(+(?x,?x_4)) and s(s(+(?x,?x_4))): joinable by {0}
check modulo joinability of s(s(+(?x_5,?y))) and s(+(?x_5,?y)): joinable by {0}
check modulo joinability of s(+(?x_4,?y)) and s(s(+(?x_4,?y))): joinable by {0}
success
P':
   [ s(s(?x)) -> s(?x) ]
Check relative termination:
   [ +(?x,0) -> ?x,
     +(?x,s(?y)) -> s(+(?x,?y)),
     +(0,?y) -> ?y,
     +(s(?x),?y) -> s(+(?x,?y)),
     dbl(?x) -> +(?x,?x) ]
   [ s(s(?x)) -> s(?x) ]
Polynomial Interpretation:
  +:= (1)*x1*x1+(2)*x1*x2+(2)*x2*x2
  0:= (5)
  s:= (1)*x1
  dbl:= (1)+(14)*x1+(11)*x1*x1
retract +(?x,0) -> ?x
retract +(0,?y) -> ?y
retract dbl(?x) -> +(?x,?x)
Polynomial Interpretation:
  +:= (2)*x1+(1)*x2
  0:= (8)
  s:= (1)+(1)*x1
  dbl:= (8)+(8)*x1
retract +(?x,0) -> ?x
retract +(0,?y) -> ?y
retract +(s(?x),?y) -> s(+(?x,?y))
retract dbl(?x) -> +(?x,?x)
retract s(s(?x)) -> s(?x)
Polynomial Interpretation:
  +:= (2)*x1+(3)*x1*x2+(2)*x2
  0:= (8)
  s:= (4)+(5)*x1
  dbl:= (9)+(10)*x1+(2)*x1*x1
relatively terminating
S/P': relatively terminating
S:
   [ +(?x,0) -> ?x,
     +(?x,s(?y)) -> s(+(?x,?y)),
     +(0,?y) -> ?y,
     +(s(?x),?y) -> s(+(?x,?y)),
     dbl(?x) -> +(?x,?x) ]
P:
   [ +(+(?x,?y),?z) -> +(?x,+(?y,?z)),
     +(?x,?y) -> +(?y,?x),
     s(?x) -> s(s(?x)),
     s(s(?x)) -> s(?x) ]
Success
Reduction-Preserving Completion
Direct Methods: CR

Final result: CR
120.trs: Success(CR)
(3089 msec.)