TSTP Solution File: SWC036+1 by Twee---2.4.2
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%------------------------------------------------------------------------------
% File : Twee---2.4.2
% Problem : SWC036+1 : TPTP v8.1.2. Released v2.4.0.
% Transfm : none
% Format : tptp:raw
% Command : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof
% Computer : n022.cluster.edu
% Model : x86_64 x86_64
% CPU : Intel(R) Xeon(R) CPU E5-2620 v4 2.10GHz
% Memory : 8042.1875MB
% OS : Linux 3.10.0-693.el7.x86_64
% CPULimit : 300s
% WCLimit : 300s
% DateTime : Thu Aug 31 20:53:32 EDT 2023
% Result : Theorem 3.22s 0.77s
% Output : Proof 3.22s
% Verified :
% SZS Type : -
% Comments :
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%----WARNING: Could not form TPTP format derivation
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%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.13 % Problem : SWC036+1 : TPTP v8.1.2. Released v2.4.0.
% 0.13/0.14 % Command : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof
% 0.14/0.35 % Computer : n022.cluster.edu
% 0.14/0.35 % Model : x86_64 x86_64
% 0.14/0.35 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.14/0.35 % Memory : 8042.1875MB
% 0.14/0.35 % OS : Linux 3.10.0-693.el7.x86_64
% 0.14/0.35 % CPULimit : 300
% 0.14/0.35 % WCLimit : 300
% 0.14/0.35 % DateTime : Mon Aug 28 17:04:39 EDT 2023
% 0.14/0.35 % CPUTime :
% 3.22/0.77 Command-line arguments: --no-flatten-goal
% 3.22/0.77
% 3.22/0.77 % SZS status Theorem
% 3.22/0.77
% 3.22/0.77 % SZS output start Proof
% 3.22/0.77 Take the following subset of the input axioms:
% 3.22/0.78 fof(co1, conjecture, ![U]: (ssList(U) => ![V]: (ssList(V) => ![W]: (ssList(W) => ![X]: (ssList(X) => (nil!=V | (V!=X | (U!=W | (nil=U | (nil!=W & nil=X)))))))))).
% 3.22/0.78
% 3.22/0.78 Now clausify the problem and encode Horn clauses using encoding 3 of
% 3.22/0.78 http://www.cse.chalmers.se/~nicsma/papers/horn.pdf.
% 3.22/0.78 We repeatedly replace C & s=t => u=v by the two clauses:
% 3.22/0.78 fresh(y, y, x1...xn) = u
% 3.22/0.78 C => fresh(s, t, x1...xn) = v
% 3.22/0.78 where fresh is a fresh function symbol and x1..xn are the free
% 3.22/0.78 variables of u and v.
% 3.22/0.78 A predicate p(X) is encoded as p(X)=true (this is sound, because the
% 3.22/0.78 input problem has no model of domain size 1).
% 3.22/0.78
% 3.22/0.78 The encoding turns the above axioms into the following unit equations and goals:
% 3.22/0.78
% 3.22/0.78 Axiom 1 (co1_1): u = w.
% 3.22/0.78 Axiom 2 (co1_2): v = x.
% 3.22/0.78 Axiom 3 (co1): nil = v.
% 3.22/0.78 Axiom 4 (co1_8): fresh14(X, X) = w.
% 3.22/0.78 Axiom 5 (co1_8): fresh14(nil, x) = nil.
% 3.22/0.78
% 3.22/0.78 Goal 1 (co1_7): nil = u.
% 3.22/0.78 Proof:
% 3.22/0.78 nil
% 3.22/0.78 = { by axiom 5 (co1_8) R->L }
% 3.22/0.78 fresh14(nil, x)
% 3.22/0.78 = { by axiom 3 (co1) }
% 3.22/0.78 fresh14(v, x)
% 3.22/0.78 = { by axiom 2 (co1_2) R->L }
% 3.22/0.78 fresh14(v, v)
% 3.22/0.78 = { by axiom 4 (co1_8) }
% 3.22/0.78 w
% 3.22/0.78 = { by axiom 1 (co1_1) R->L }
% 3.22/0.78 u
% 3.22/0.78 % SZS output end Proof
% 3.22/0.78
% 3.22/0.78 RESULT: Theorem (the conjecture is true).
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