2.16/1.84	YES
2.16/1.85	We consider the system theBenchmark.
2.16/1.85	
2.16/1.85	  Alphabet:
2.16/1.85	
2.16/1.85	    !facplus : [a * a] --> a 
2.16/1.85	    !factimes : [a * a] --> a 
2.16/1.85	    0 : [] --> a 
2.16/1.85	    cons : [c * d] --> d 
2.16/1.85	    fact : [a] --> a 
2.16/1.85	    false : [] --> b 
2.16/1.85	    filter : [c -> b * d] --> d 
2.16/1.85	    filter2 : [b * c -> b * c * d] --> d 
2.16/1.85	    map : [c -> c * d] --> d 
2.16/1.85	    nil : [] --> d 
2.16/1.85	    p : [a] --> a 
2.16/1.85	    s : [a] --> a 
2.16/1.85	    true : [] --> b 
2.16/1.85	
2.16/1.85	  Rules:
2.16/1.85	
2.16/1.85	    p(s(x)) => x 
2.16/1.85	    fact(0) => s(0) 
2.16/1.85	    fact(s(x)) => !factimes(s(x), fact(p(s(x)))) 
2.16/1.85	    !factimes(0, x) => 0 
2.16/1.85	    !factimes(s(x), y) => !facplus(!factimes(x, y), y) 
2.16/1.85	    !facplus(x, 0) => x 
2.16/1.85	    !facplus(x, s(y)) => s(!facplus(x, y)) 
2.16/1.85	    map(f, nil) => nil 
2.16/1.85	    map(f, cons(x, y)) => cons(f x, map(f, y)) 
2.16/1.85	    filter(f, nil) => nil 
2.16/1.85	    filter(f, cons(x, y)) => filter2(f x, f, x, y) 
2.16/1.85	    filter2(true, f, x, y) => cons(x, filter(f, y)) 
2.16/1.85	    filter2(false, f, x, y) => filter(f, y) 
2.16/1.85	
2.16/1.85	This AFS is converted to an AFSM simply by replacing all free variables by meta-variables (with arity 0).
2.16/1.85	
2.16/1.85	We observe that the rules contain a first-order subset:
2.16/1.85	
2.16/1.85	  p(s(X)) => X 
2.16/1.85	  fact(0) => s(0) 
2.16/1.85	  fact(s(X)) => !factimes(s(X), fact(p(s(X)))) 
2.16/1.85	  !factimes(0, X) => 0 
2.16/1.85	  !factimes(s(X), Y) => !facplus(!factimes(X, Y), Y) 
2.16/1.85	  !facplus(X, 0) => X 
2.16/1.85	  !facplus(X, s(Y)) => s(!facplus(X, Y)) 
2.16/1.85	
2.16/1.85	Moreover, the system is orthogonal.  Thus, by [Kop12, Thm. 7.55], we may omit all first-order dependency pairs from the dependency pair problem (DP(R), R) if this first-order part is terminating when seen as a many-sorted first-order TRS.
2.16/1.85	
2.16/1.85	According to the external first-order termination prover, this system is indeed terminating:
2.16/1.85	
2.16/1.85	 || proof of resources/system.trs
2.16/1.85	 || # AProVE Commit ID: d84c10301d352dfd14de2104819581f4682260f5 fuhs 20130616
2.16/1.85	 || 
2.16/1.85	 || 
2.16/1.85	 || Termination w.r.t. Q of the given QTRS could be proven:
2.16/1.85	 || 
2.16/1.85	 || (0) QTRS
2.16/1.85	 || (1) Overlay + Local Confluence [EQUIVALENT]
2.16/1.85	 || (2) QTRS
2.16/1.85	 || (3) DependencyPairsProof [EQUIVALENT]
2.16/1.85	 || (4) QDP
2.16/1.85	 || (5) DependencyGraphProof [EQUIVALENT]
2.16/1.85	 || (6) AND
2.16/1.85	 ||     (7) QDP
2.16/1.85	 ||         (8) UsableRulesProof [EQUIVALENT]
2.16/1.85	 ||         (9) QDP
2.16/1.85	 ||         (10) QReductionProof [EQUIVALENT]
2.16/1.85	 ||         (11) QDP
2.16/1.85	 ||         (12) QDPSizeChangeProof [EQUIVALENT]
2.16/1.85	 ||         (13) YES
2.16/1.85	 ||     (14) QDP
2.16/1.85	 ||         (15) UsableRulesProof [EQUIVALENT]
2.16/1.85	 ||         (16) QDP
2.16/1.85	 ||         (17) QReductionProof [EQUIVALENT]
2.16/1.85	 ||         (18) QDP
2.16/1.85	 ||         (19) QDPSizeChangeProof [EQUIVALENT]
2.16/1.85	 ||         (20) YES
2.16/1.85	 ||     (21) QDP
2.16/1.85	 ||         (22) UsableRulesProof [EQUIVALENT]
2.16/1.85	 ||         (23) QDP
2.16/1.85	 ||         (24) QReductionProof [EQUIVALENT]
2.16/1.85	 ||         (25) QDP
2.16/1.85	 ||         (26) MRRProof [EQUIVALENT]
2.16/1.85	 ||         (27) QDP
2.16/1.85	 ||         (28) DependencyGraphProof [EQUIVALENT]
2.16/1.85	 ||         (29) TRUE
2.16/1.85	 || 
2.16/1.85	 || 
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (0)
2.16/1.85	 || Obligation:
2.16/1.85	 || Q restricted rewrite system:
2.16/1.85	 || The TRS R consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(%X)) -> %X
2.16/1.85	 ||    fact(0) -> s(0)
2.16/1.85	 ||    fact(s(%X)) -> !factimes(s(%X), fact(p(s(%X))))
2.16/1.85	 ||    !factimes(0, %X) -> 0
2.16/1.85	 ||    !factimes(s(%X), %Y) -> !facplus(!factimes(%X, %Y), %Y)
2.16/1.85	 ||    !facplus(%X, 0) -> %X
2.16/1.85	 ||    !facplus(%X, s(%Y)) -> s(!facplus(%X, %Y))
2.16/1.85	 || 
2.16/1.85	 || Q is empty.
2.16/1.85	 || 
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (1) Overlay + Local Confluence (EQUIVALENT)
2.16/1.85	 || The TRS is overlay and locally confluent. By [NOC] we can switch to innermost.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (2)
2.16/1.85	 || Obligation:
2.16/1.85	 || Q restricted rewrite system:
2.16/1.85	 || The TRS R consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(%X)) -> %X
2.16/1.85	 ||    fact(0) -> s(0)
2.16/1.85	 ||    fact(s(%X)) -> !factimes(s(%X), fact(p(s(%X))))
2.16/1.85	 ||    !factimes(0, %X) -> 0
2.16/1.85	 ||    !factimes(s(%X), %Y) -> !facplus(!factimes(%X, %Y), %Y)
2.16/1.85	 ||    !facplus(%X, 0) -> %X
2.16/1.85	 ||    !facplus(%X, s(%Y)) -> s(!facplus(%X, %Y))
2.16/1.85	 || 
2.16/1.85	 || The set Q consists of the following terms:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(x0))
2.16/1.85	 ||    fact(0)
2.16/1.85	 ||    fact(s(x0))
2.16/1.85	 ||    !factimes(0, x0)
2.16/1.85	 ||    !factimes(s(x0), x1)
2.16/1.85	 ||    !facplus(x0, 0)
2.16/1.85	 ||    !facplus(x0, s(x1))
2.16/1.85	 || 
2.16/1.85	 || 
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (3) DependencyPairsProof (EQUIVALENT)
2.16/1.85	 || Using Dependency Pairs [AG00,LPAR04] we result in the following initial DP problem.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (4)
2.16/1.85	 || Obligation:
2.16/1.85	 || Q DP problem:
2.16/1.85	 || The TRS P consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    FACT(s(%X)) -> !FACTIMES(s(%X), fact(p(s(%X))))
2.16/1.85	 ||    FACT(s(%X)) -> FACT(p(s(%X)))
2.16/1.85	 ||    FACT(s(%X)) -> P(s(%X))
2.16/1.85	 ||    !FACTIMES(s(%X), %Y) -> !FACPLUS(!factimes(%X, %Y), %Y)
2.16/1.85	 ||    !FACTIMES(s(%X), %Y) -> !FACTIMES(%X, %Y)
2.16/1.85	 ||    !FACPLUS(%X, s(%Y)) -> !FACPLUS(%X, %Y)
2.16/1.85	 || 
2.16/1.85	 || The TRS R consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(%X)) -> %X
2.16/1.85	 ||    fact(0) -> s(0)
2.16/1.85	 ||    fact(s(%X)) -> !factimes(s(%X), fact(p(s(%X))))
2.16/1.85	 ||    !factimes(0, %X) -> 0
2.16/1.85	 ||    !factimes(s(%X), %Y) -> !facplus(!factimes(%X, %Y), %Y)
2.16/1.85	 ||    !facplus(%X, 0) -> %X
2.16/1.85	 ||    !facplus(%X, s(%Y)) -> s(!facplus(%X, %Y))
2.16/1.85	 || 
2.16/1.85	 || The set Q consists of the following terms:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(x0))
2.16/1.85	 ||    fact(0)
2.16/1.85	 ||    fact(s(x0))
2.16/1.85	 ||    !factimes(0, x0)
2.16/1.85	 ||    !factimes(s(x0), x1)
2.16/1.85	 ||    !facplus(x0, 0)
2.16/1.85	 ||    !facplus(x0, s(x1))
2.16/1.85	 || 
2.16/1.85	 || We have to consider all minimal (P,Q,R)-chains.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (5) DependencyGraphProof (EQUIVALENT)
2.16/1.85	 || The approximation of the Dependency Graph [LPAR04,FROCOS05,EDGSTAR] contains 3 SCCs with 3 less nodes.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (6)
2.16/1.85	 || Complex Obligation (AND)
2.16/1.85	 || 
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (7)
2.16/1.85	 || Obligation:
2.16/1.85	 || Q DP problem:
2.16/1.85	 || The TRS P consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    !FACPLUS(%X, s(%Y)) -> !FACPLUS(%X, %Y)
2.16/1.85	 || 
2.16/1.85	 || The TRS R consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(%X)) -> %X
2.16/1.85	 ||    fact(0) -> s(0)
2.16/1.85	 ||    fact(s(%X)) -> !factimes(s(%X), fact(p(s(%X))))
2.16/1.85	 ||    !factimes(0, %X) -> 0
2.16/1.85	 ||    !factimes(s(%X), %Y) -> !facplus(!factimes(%X, %Y), %Y)
2.16/1.85	 ||    !facplus(%X, 0) -> %X
2.16/1.85	 ||    !facplus(%X, s(%Y)) -> s(!facplus(%X, %Y))
2.16/1.85	 || 
2.16/1.85	 || The set Q consists of the following terms:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(x0))
2.16/1.85	 ||    fact(0)
2.16/1.85	 ||    fact(s(x0))
2.16/1.85	 ||    !factimes(0, x0)
2.16/1.85	 ||    !factimes(s(x0), x1)
2.16/1.85	 ||    !facplus(x0, 0)
2.16/1.85	 ||    !facplus(x0, s(x1))
2.16/1.85	 || 
2.16/1.85	 || We have to consider all minimal (P,Q,R)-chains.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (8) UsableRulesProof (EQUIVALENT)
2.16/1.85	 || As all Q-normal forms are R-normal forms we are in the innermost case. Hence, by the usable rules processor [LPAR04] we can delete all non-usable rules [FROCOS05] from R.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (9)
2.16/1.85	 || Obligation:
2.16/1.85	 || Q DP problem:
2.16/1.85	 || The TRS P consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    !FACPLUS(%X, s(%Y)) -> !FACPLUS(%X, %Y)
2.16/1.85	 || 
2.16/1.85	 || R is empty.
2.16/1.85	 || The set Q consists of the following terms:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(x0))
2.16/1.85	 ||    fact(0)
2.16/1.85	 ||    fact(s(x0))
2.16/1.85	 ||    !factimes(0, x0)
2.16/1.85	 ||    !factimes(s(x0), x1)
2.16/1.85	 ||    !facplus(x0, 0)
2.16/1.85	 ||    !facplus(x0, s(x1))
2.16/1.85	 || 
2.16/1.85	 || We have to consider all minimal (P,Q,R)-chains.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (10) QReductionProof (EQUIVALENT)
2.16/1.85	 || We deleted the following terms from Q as each root-symbol of these terms does neither occur in P nor in R.[THIEMANN].
2.16/1.85	 || 
2.16/1.85	 ||    p(s(x0))
2.16/1.85	 ||    fact(0)
2.16/1.85	 ||    fact(s(x0))
2.16/1.85	 ||    !factimes(0, x0)
2.16/1.85	 ||    !factimes(s(x0), x1)
2.16/1.85	 ||    !facplus(x0, 0)
2.16/1.85	 ||    !facplus(x0, s(x1))
2.16/1.85	 || 
2.16/1.85	 || 
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (11)
2.16/1.85	 || Obligation:
2.16/1.85	 || Q DP problem:
2.16/1.85	 || The TRS P consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    !FACPLUS(%X, s(%Y)) -> !FACPLUS(%X, %Y)
2.16/1.85	 || 
2.16/1.85	 || R is empty.
2.16/1.85	 || Q is empty.
2.16/1.85	 || We have to consider all minimal (P,Q,R)-chains.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (12) QDPSizeChangeProof (EQUIVALENT)
2.16/1.85	 || By using the subterm criterion [SUBTERM_CRITERION] together with the size-change analysis [AAECC05] we have proven that there are no infinite chains for this DP problem. 
2.16/1.85	 || 
2.16/1.85	 || From the DPs we obtained the following set of size-change graphs:
2.16/1.85	 || *!FACPLUS(%X, s(%Y)) -> !FACPLUS(%X, %Y)
2.16/1.85	 || The graph contains the following edges 1 >= 1, 2 > 2
2.16/1.85	 || 
2.16/1.85	 || 
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (13)
2.16/1.85	 || YES
2.16/1.85	 || 
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (14)
2.16/1.85	 || Obligation:
2.16/1.85	 || Q DP problem:
2.16/1.85	 || The TRS P consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    !FACTIMES(s(%X), %Y) -> !FACTIMES(%X, %Y)
2.16/1.85	 || 
2.16/1.85	 || The TRS R consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(%X)) -> %X
2.16/1.85	 ||    fact(0) -> s(0)
2.16/1.85	 ||    fact(s(%X)) -> !factimes(s(%X), fact(p(s(%X))))
2.16/1.85	 ||    !factimes(0, %X) -> 0
2.16/1.85	 ||    !factimes(s(%X), %Y) -> !facplus(!factimes(%X, %Y), %Y)
2.16/1.85	 ||    !facplus(%X, 0) -> %X
2.16/1.85	 ||    !facplus(%X, s(%Y)) -> s(!facplus(%X, %Y))
2.16/1.85	 || 
2.16/1.85	 || The set Q consists of the following terms:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(x0))
2.16/1.85	 ||    fact(0)
2.16/1.85	 ||    fact(s(x0))
2.16/1.85	 ||    !factimes(0, x0)
2.16/1.85	 ||    !factimes(s(x0), x1)
2.16/1.85	 ||    !facplus(x0, 0)
2.16/1.85	 ||    !facplus(x0, s(x1))
2.16/1.85	 || 
2.16/1.85	 || We have to consider all minimal (P,Q,R)-chains.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (15) UsableRulesProof (EQUIVALENT)
2.16/1.85	 || As all Q-normal forms are R-normal forms we are in the innermost case. Hence, by the usable rules processor [LPAR04] we can delete all non-usable rules [FROCOS05] from R.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (16)
2.16/1.85	 || Obligation:
2.16/1.85	 || Q DP problem:
2.16/1.85	 || The TRS P consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    !FACTIMES(s(%X), %Y) -> !FACTIMES(%X, %Y)
2.16/1.85	 || 
2.16/1.85	 || R is empty.
2.16/1.85	 || The set Q consists of the following terms:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(x0))
2.16/1.85	 ||    fact(0)
2.16/1.85	 ||    fact(s(x0))
2.16/1.85	 ||    !factimes(0, x0)
2.16/1.85	 ||    !factimes(s(x0), x1)
2.16/1.85	 ||    !facplus(x0, 0)
2.16/1.85	 ||    !facplus(x0, s(x1))
2.16/1.85	 || 
2.16/1.85	 || We have to consider all minimal (P,Q,R)-chains.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (17) QReductionProof (EQUIVALENT)
2.16/1.85	 || We deleted the following terms from Q as each root-symbol of these terms does neither occur in P nor in R.[THIEMANN].
2.16/1.85	 || 
2.16/1.85	 ||    p(s(x0))
2.16/1.85	 ||    fact(0)
2.16/1.85	 ||    fact(s(x0))
2.16/1.85	 ||    !factimes(0, x0)
2.16/1.85	 ||    !factimes(s(x0), x1)
2.16/1.85	 ||    !facplus(x0, 0)
2.16/1.85	 ||    !facplus(x0, s(x1))
2.16/1.85	 || 
2.16/1.85	 || 
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (18)
2.16/1.85	 || Obligation:
2.16/1.85	 || Q DP problem:
2.16/1.85	 || The TRS P consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    !FACTIMES(s(%X), %Y) -> !FACTIMES(%X, %Y)
2.16/1.85	 || 
2.16/1.85	 || R is empty.
2.16/1.85	 || Q is empty.
2.16/1.85	 || We have to consider all minimal (P,Q,R)-chains.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (19) QDPSizeChangeProof (EQUIVALENT)
2.16/1.85	 || By using the subterm criterion [SUBTERM_CRITERION] together with the size-change analysis [AAECC05] we have proven that there are no infinite chains for this DP problem. 
2.16/1.85	 || 
2.16/1.85	 || From the DPs we obtained the following set of size-change graphs:
2.16/1.85	 || *!FACTIMES(s(%X), %Y) -> !FACTIMES(%X, %Y)
2.16/1.85	 || The graph contains the following edges 1 > 1, 2 >= 2
2.16/1.85	 || 
2.16/1.85	 || 
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (20)
2.16/1.85	 || YES
2.16/1.85	 || 
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (21)
2.16/1.85	 || Obligation:
2.16/1.85	 || Q DP problem:
2.16/1.85	 || The TRS P consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    FACT(s(%X)) -> FACT(p(s(%X)))
2.16/1.85	 || 
2.16/1.85	 || The TRS R consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(%X)) -> %X
2.16/1.85	 ||    fact(0) -> s(0)
2.16/1.85	 ||    fact(s(%X)) -> !factimes(s(%X), fact(p(s(%X))))
2.16/1.85	 ||    !factimes(0, %X) -> 0
2.16/1.85	 ||    !factimes(s(%X), %Y) -> !facplus(!factimes(%X, %Y), %Y)
2.16/1.85	 ||    !facplus(%X, 0) -> %X
2.16/1.85	 ||    !facplus(%X, s(%Y)) -> s(!facplus(%X, %Y))
2.16/1.85	 || 
2.16/1.85	 || The set Q consists of the following terms:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(x0))
2.16/1.85	 ||    fact(0)
2.16/1.85	 ||    fact(s(x0))
2.16/1.85	 ||    !factimes(0, x0)
2.16/1.85	 ||    !factimes(s(x0), x1)
2.16/1.85	 ||    !facplus(x0, 0)
2.16/1.85	 ||    !facplus(x0, s(x1))
2.16/1.85	 || 
2.16/1.85	 || We have to consider all minimal (P,Q,R)-chains.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (22) UsableRulesProof (EQUIVALENT)
2.16/1.85	 || As all Q-normal forms are R-normal forms we are in the innermost case. Hence, by the usable rules processor [LPAR04] we can delete all non-usable rules [FROCOS05] from R.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (23)
2.16/1.85	 || Obligation:
2.16/1.85	 || Q DP problem:
2.16/1.85	 || The TRS P consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    FACT(s(%X)) -> FACT(p(s(%X)))
2.16/1.85	 || 
2.16/1.85	 || The TRS R consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(%X)) -> %X
2.16/1.85	 || 
2.16/1.85	 || The set Q consists of the following terms:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(x0))
2.16/1.85	 ||    fact(0)
2.16/1.85	 ||    fact(s(x0))
2.16/1.85	 ||    !factimes(0, x0)
2.16/1.85	 ||    !factimes(s(x0), x1)
2.16/1.85	 ||    !facplus(x0, 0)
2.16/1.85	 ||    !facplus(x0, s(x1))
2.16/1.85	 || 
2.16/1.85	 || We have to consider all minimal (P,Q,R)-chains.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (24) QReductionProof (EQUIVALENT)
2.16/1.85	 || We deleted the following terms from Q as each root-symbol of these terms does neither occur in P nor in R.[THIEMANN].
2.16/1.85	 || 
2.16/1.85	 ||    fact(0)
2.16/1.85	 ||    fact(s(x0))
2.16/1.85	 ||    !factimes(0, x0)
2.16/1.85	 ||    !factimes(s(x0), x1)
2.16/1.85	 ||    !facplus(x0, 0)
2.16/1.85	 ||    !facplus(x0, s(x1))
2.16/1.85	 || 
2.16/1.85	 || 
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (25)
2.16/1.85	 || Obligation:
2.16/1.85	 || Q DP problem:
2.16/1.85	 || The TRS P consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    FACT(s(%X)) -> FACT(p(s(%X)))
2.16/1.85	 || 
2.16/1.85	 || The TRS R consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(%X)) -> %X
2.16/1.85	 || 
2.16/1.85	 || The set Q consists of the following terms:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(x0))
2.16/1.85	 || 
2.16/1.85	 || We have to consider all minimal (P,Q,R)-chains.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (26) MRRProof (EQUIVALENT)
2.16/1.85	 || By using the rule removal processor [LPAR04] with the following ordering, at least one Dependency Pair or term rewrite system rule of this QDP problem can be strictly oriented.
2.16/1.85	 || 
2.16/1.85	 || 
2.16/1.85	 || Strictly oriented rules of the TRS R:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(%X)) -> %X
2.16/1.85	 || 
2.16/1.85	 || Used ordering: Polynomial interpretation [POLO]:
2.16/1.85	 || 
2.16/1.85	 ||    POL(FACT(x_1)) = x_1
2.16/1.85	 ||    POL(p(x_1)) = x_1
2.16/1.85	 ||    POL(s(x_1)) = 1 + x_1
2.16/1.85	 || 
2.16/1.85	 || 
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (27)
2.16/1.85	 || Obligation:
2.16/1.85	 || Q DP problem:
2.16/1.85	 || The TRS P consists of the following rules:
2.16/1.85	 || 
2.16/1.85	 ||    FACT(s(%X)) -> FACT(p(s(%X)))
2.16/1.85	 || 
2.16/1.85	 || R is empty.
2.16/1.85	 || The set Q consists of the following terms:
2.16/1.85	 || 
2.16/1.85	 ||    p(s(x0))
2.16/1.85	 || 
2.16/1.85	 || We have to consider all minimal (P,Q,R)-chains.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (28) DependencyGraphProof (EQUIVALENT)
2.16/1.85	 || The approximation of the Dependency Graph [LPAR04,FROCOS05,EDGSTAR] contains 0 SCCs with 1 less node.
2.16/1.85	 || ----------------------------------------
2.16/1.85	 || 
2.16/1.85	 || (29)
2.16/1.85	 || TRUE
2.16/1.85	 || 
2.16/1.85	We use the dependency pair framework as described in [Kop12, Ch. 6/7], with static dependency pairs (see [KusIsoSakBla09] and the adaptation for AFSMs and accessible arguments in [Kop13]).
2.16/1.85	
2.16/1.85	We thus obtain the following dependency pair problem (P_0, R_0, static, formative):
2.16/1.85	
2.16/1.85	  Dependency Pairs P_0:
2.16/1.85	
2.16/1.85	    0] map#(F, cons(X, Y)) =#> map#(F, Y)   
2.16/1.85	    1] filter#(F, cons(X, Y)) =#> filter2#(F X, F, X, Y)   
2.16/1.85	    2] filter2#(true, F, X, Y) =#> filter#(F, Y)   
2.16/1.85	    3] filter2#(false, F, X, Y) =#> filter#(F, Y)   
2.16/1.85	
2.16/1.85	  Rules R_0:
2.16/1.85	
2.16/1.85	    p(s(X)) => X 
2.16/1.85	    fact(0) => s(0) 
2.16/1.85	    fact(s(X)) => !factimes(s(X), fact(p(s(X)))) 
2.16/1.85	    !factimes(0, X) => 0 
2.16/1.85	    !factimes(s(X), Y) => !facplus(!factimes(X, Y), Y) 
2.16/1.85	    !facplus(X, 0) => X 
2.16/1.85	    !facplus(X, s(Y)) => s(!facplus(X, Y)) 
2.16/1.85	    map(F, nil) => nil 
2.16/1.85	    map(F, cons(X, Y)) => cons(F X, map(F, Y)) 
2.16/1.85	    filter(F, nil) => nil 
2.16/1.85	    filter(F, cons(X, Y)) => filter2(F X, F, X, Y) 
2.16/1.85	    filter2(true, F, X, Y) => cons(X, filter(F, Y)) 
2.16/1.85	    filter2(false, F, X, Y) => filter(F, Y) 
2.16/1.85	
2.16/1.85	Thus, the original system is terminating if (P_0, R_0, static, formative) is finite.
2.16/1.85	
2.16/1.85	We consider the dependency pair problem (P_0, R_0, static, formative).
2.16/1.85	
2.16/1.85	We place the elements of P in a dependency graph approximation G (see e.g. [Kop12, Thm. 7.27, 7.29], as follows:
2.16/1.85	
2.16/1.85	    * 0 : 0 
2.16/1.85	    * 1 : 2, 3 
2.16/1.85	    * 2 : 1 
2.16/1.85	    * 3 : 1 
2.16/1.85	
2.16/1.85	This graph has the following strongly connected components:
2.16/1.85	
2.16/1.85	  P_1:
2.16/1.85	
2.16/1.85	    map#(F, cons(X, Y)) =#> map#(F, Y)   
2.16/1.85	
2.16/1.85	  P_2:
2.16/1.85	
2.16/1.85	    filter#(F, cons(X, Y)) =#> filter2#(F X, F, X, Y)   
2.16/1.85	    filter2#(true, F, X, Y) =#> filter#(F, Y)   
2.16/1.85	    filter2#(false, F, X, Y) =#> filter#(F, Y)   
2.16/1.85	
2.16/1.85	By [Kop12, Thm. 7.31], we may replace any dependency pair problem (P_0, R_0, m, f) by (P_1, R_0, m, f) and (P_2, R_0, m, f).
2.16/1.85	
2.16/1.85	Thus, the original system is terminating if each of (P_1, R_0, static, formative) and (P_2, R_0, static, formative) is finite.
2.16/1.85	
2.16/1.85	We consider the dependency pair problem (P_2, R_0, static, formative).
2.16/1.85	
2.16/1.85	We apply the subterm criterion with the following projection function:
2.16/1.85	
2.16/1.85	  nu(filter2#) = 4 
2.16/1.85	  nu(filter#) = 2 
2.16/1.85	
2.16/1.85	Thus, we can orient the dependency pairs as follows:
2.16/1.85	
2.16/1.85	  nu(filter#(F, cons(X, Y))) = cons(X, Y) |> Y = nu(filter2#(F X, F, X, Y)) 
2.16/1.85	  nu(filter2#(true, F, X, Y)) = Y = Y = nu(filter#(F, Y)) 
2.16/1.85	  nu(filter2#(false, F, X, Y)) = Y = Y = nu(filter#(F, Y)) 
2.16/1.85	
2.16/1.85	By [Kop12, Thm. 7.35] and [Kop13, Thm. 5], we may replace a dependency pair problem (P_2, R_0, static, f) by (P_3, R_0, static, f), where P_3 contains:
2.16/1.85	
2.16/1.85	  filter2#(true, F, X, Y) =#> filter#(F, Y)   
2.16/1.85	  filter2#(false, F, X, Y) =#> filter#(F, Y)   
2.16/1.85	
2.16/1.85	Thus, the original system is terminating if each of (P_1, R_0, static, formative) and (P_3, R_0, static, formative) is finite.
2.16/1.85	
2.16/1.85	We consider the dependency pair problem (P_3, R_0, static, formative).
2.16/1.85	
2.16/1.85	We place the elements of P in a dependency graph approximation G (see e.g. [Kop12, Thm. 7.27, 7.29], as follows:
2.16/1.85	
2.16/1.85	    * 0 :  
2.16/1.85	    * 1 :  
2.16/1.85	
2.16/1.85	This graph has no strongly connected components.  By [Kop12, Thm. 7.31], this implies finiteness of the dependency pair problem.
2.16/1.85	
2.16/1.85	Thus, the original system is terminating if (P_1, R_0, static, formative) is finite.
2.16/1.85	
2.16/1.85	We consider the dependency pair problem (P_1, R_0, static, formative).
2.16/1.85	
2.16/1.85	We apply the subterm criterion with the following projection function:
2.16/1.85	
2.16/1.85	  nu(map#) = 2 
2.16/1.85	
2.16/1.85	Thus, we can orient the dependency pairs as follows:
2.16/1.85	
2.16/1.85	  nu(map#(F, cons(X, Y))) = cons(X, Y) |> Y = nu(map#(F, Y)) 
2.16/1.85	
2.16/1.85	By [Kop12, Thm. 7.35] and [Kop13, Thm. 5], we may replace a dependency pair problem (P_1, R_0, static, f) by ({}, R_0, static, f).  By the empty set processor [Kop12, Thm. 7.15] this problem may be immediately removed.
2.16/1.85	
2.16/1.85	As all dependency pair problems were succesfully simplified with sound (and complete) processors until nothing remained, we conclude termination.
2.16/1.85	
2.16/1.85	
2.16/1.85	+++ Citations +++
2.16/1.85	
2.16/1.85	[Kop12]  C. Kop.  Higher Order Termination.  PhD Thesis, 2012.
2.16/1.85	[Kop13]  C. Kop.  Static Dependency Pairs with Accessibility.  Unpublished manuscript, http://cl-informatik.uibk.ac.at/users/kop/static.pdf, 2013.
2.16/1.85	[KusIsoSakBla09]  K. Kusakari, Y. Isogai, M. Sakai, and F. Blanqui.  Static Dependency Pair Method Based On Strong Computability for Higher-Order Rewrite Systems.  In volume 92(10) of IEICE Transactions on Information and Systems.  2007--2015, 2009.
2.16/1.85	EOF