TSTP Solution File: CAT012-3 by Twee---2.4.2
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% File : Twee---2.4.2
% Problem : CAT012-3 : TPTP v8.1.2. Released v1.0.0.
% 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 : n014.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 : Wed Aug 30 18:18:55 EDT 2023
% Result : Unsatisfiable 0.23s 0.43s
% Output : Proof 0.23s
% Verified :
% SZS Type : -
% Comments :
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%----WARNING: Could not form TPTP format derivation
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%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.14 % Problem : CAT012-3 : TPTP v8.1.2. Released v1.0.0.
% 0.00/0.15 % Command : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof
% 0.15/0.37 % Computer : n014.cluster.edu
% 0.15/0.37 % Model : x86_64 x86_64
% 0.15/0.37 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.15/0.37 % Memory : 8042.1875MB
% 0.15/0.37 % OS : Linux 3.10.0-693.el7.x86_64
% 0.15/0.37 % CPULimit : 300
% 0.15/0.37 % WCLimit : 300
% 0.15/0.37 % DateTime : Sun Aug 27 00:02:02 EDT 2023
% 0.23/0.37 % CPUTime :
% 0.23/0.43 Command-line arguments: --lhs-weight 1 --flip-ordering --normalise-queue-percent 10 --cp-renormalise-threshold 10
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% 0.23/0.43 % SZS status Unsatisfiable
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% 0.23/0.43 % SZS output start Proof
% 0.23/0.43 Take the following subset of the input axioms:
% 0.23/0.43 fof(assume_domain_exists, hypothesis, there_exists(domain(a))).
% 0.23/0.43 fof(compose_domain, axiom, ![X]: compose(X, domain(X))=X).
% 0.23/0.43 fof(domain_codomain_composition1, axiom, ![Y, X2]: (~there_exists(compose(X2, Y)) | domain(X2)=codomain(Y))).
% 0.23/0.43 fof(domain_has_elements, axiom, ![X2]: (~there_exists(domain(X2)) | there_exists(X2))).
% 0.23/0.43 fof(prove_codomain_of_domain_is_domain, negated_conjecture, codomain(domain(a))!=domain(a)).
% 0.23/0.43
% 0.23/0.43 Now clausify the problem and encode Horn clauses using encoding 3 of
% 0.23/0.43 http://www.cse.chalmers.se/~nicsma/papers/horn.pdf.
% 0.23/0.43 We repeatedly replace C & s=t => u=v by the two clauses:
% 0.23/0.43 fresh(y, y, x1...xn) = u
% 0.23/0.43 C => fresh(s, t, x1...xn) = v
% 0.23/0.43 where fresh is a fresh function symbol and x1..xn are the free
% 0.23/0.43 variables of u and v.
% 0.23/0.43 A predicate p(X) is encoded as p(X)=true (this is sound, because the
% 0.23/0.43 input problem has no model of domain size 1).
% 0.23/0.43
% 0.23/0.43 The encoding turns the above axioms into the following unit equations and goals:
% 0.23/0.43
% 0.23/0.43 Axiom 1 (assume_domain_exists): there_exists(domain(a)) = true.
% 0.23/0.43 Axiom 2 (compose_domain): compose(X, domain(X)) = X.
% 0.23/0.43 Axiom 3 (domain_has_elements): fresh8(X, X, Y) = true.
% 0.23/0.43 Axiom 4 (domain_codomain_composition1): fresh11(X, X, Y, Z) = codomain(Z).
% 0.23/0.43 Axiom 5 (domain_has_elements): fresh8(there_exists(domain(X)), true, X) = there_exists(X).
% 0.23/0.43 Axiom 6 (domain_codomain_composition1): fresh11(there_exists(compose(X, Y)), true, X, Y) = domain(X).
% 0.23/0.43
% 0.23/0.43 Goal 1 (prove_codomain_of_domain_is_domain): codomain(domain(a)) = domain(a).
% 0.23/0.43 Proof:
% 0.23/0.43 codomain(domain(a))
% 0.23/0.43 = { by axiom 4 (domain_codomain_composition1) R->L }
% 0.23/0.43 fresh11(true, true, a, domain(a))
% 0.23/0.43 = { by axiom 3 (domain_has_elements) R->L }
% 0.23/0.43 fresh11(fresh8(true, true, a), true, a, domain(a))
% 0.23/0.43 = { by axiom 1 (assume_domain_exists) R->L }
% 0.23/0.43 fresh11(fresh8(there_exists(domain(a)), true, a), true, a, domain(a))
% 0.23/0.43 = { by axiom 5 (domain_has_elements) }
% 0.23/0.43 fresh11(there_exists(a), true, a, domain(a))
% 0.23/0.43 = { by axiom 2 (compose_domain) R->L }
% 0.23/0.43 fresh11(there_exists(compose(a, domain(a))), true, a, domain(a))
% 0.23/0.43 = { by axiom 6 (domain_codomain_composition1) }
% 0.23/0.43 domain(a)
% 0.23/0.43 % SZS output end Proof
% 0.23/0.43
% 0.23/0.43 RESULT: Unsatisfiable (the axioms are contradictory).
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