TSTP Solution File: FLD067-4 by Twee---2.4.2
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% File : Twee---2.4.2
% Problem : FLD067-4 : TPTP v8.1.2. Bugfixed v2.1.0.
% 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 : n018.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 22:37:11 EDT 2023
% Result : Unsatisfiable 20.53s 3.10s
% Output : Proof 21.16s
% Verified :
% SZS Type : -
% Comments :
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%----WARNING: Could not form TPTP format derivation
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%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.12 % Problem : FLD067-4 : TPTP v8.1.2. Bugfixed v2.1.0.
% 0.00/0.13 % Command : parallel-twee %s --tstp --conditional-encoding if --smaller --drop-non-horn --give-up-on-saturation --explain-encoding --formal-proof
% 0.13/0.34 % Computer : n018.cluster.edu
% 0.13/0.34 % Model : x86_64 x86_64
% 0.13/0.34 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.13/0.34 % Memory : 8042.1875MB
% 0.13/0.34 % OS : Linux 3.10.0-693.el7.x86_64
% 0.13/0.34 % CPULimit : 300
% 0.13/0.34 % WCLimit : 300
% 0.13/0.34 % DateTime : Mon Aug 28 00:53:01 EDT 2023
% 0.13/0.34 % CPUTime :
% 20.53/3.10 Command-line arguments: --kbo-weight0 --lhs-weight 5 --flip-ordering --normalise-queue-percent 10 --cp-renormalise-threshold 10 --goal-heuristic
% 20.53/3.10
% 20.53/3.10 % SZS status Unsatisfiable
% 20.53/3.10
% 21.16/3.10 % SZS output start Proof
% 21.16/3.10 Take the following subset of the input axioms:
% 21.16/3.10 fof(a_is_defined, hypothesis, defined(a)).
% 21.16/3.10 fof(commutativity_addition, axiom, ![X, Y, Z]: (sum(Y, X, Z) | ~sum(X, Y, Z))).
% 21.16/3.10 fof(compatibility_of_order_relation_and_addition, axiom, ![V, U, X2, Y2, Z2]: (less_or_equal(U, V) | (~less_or_equal(X2, Y2) | (~sum(X2, Z2, U) | ~sum(Y2, Z2, V))))).
% 21.16/3.10 fof(existence_of_inverse_addition, axiom, ![X2]: (sum(additive_inverse(X2), X2, additive_identity) | ~defined(X2))).
% 21.16/3.10 fof(less_or_equal_4, negated_conjecture, less_or_equal(a, b)).
% 21.16/3.10 fof(not_less_or_equal_6, negated_conjecture, ~less_or_equal(additive_identity, u)).
% 21.16/3.10 fof(sum_5, negated_conjecture, sum(b, additive_inverse(a), u)).
% 21.16/3.10
% 21.16/3.10 Now clausify the problem and encode Horn clauses using encoding 3 of
% 21.16/3.10 http://www.cse.chalmers.se/~nicsma/papers/horn.pdf.
% 21.16/3.10 We repeatedly replace C & s=t => u=v by the two clauses:
% 21.16/3.10 fresh(y, y, x1...xn) = u
% 21.16/3.10 C => fresh(s, t, x1...xn) = v
% 21.16/3.10 where fresh is a fresh function symbol and x1..xn are the free
% 21.16/3.10 variables of u and v.
% 21.16/3.10 A predicate p(X) is encoded as p(X)=true (this is sound, because the
% 21.16/3.10 input problem has no model of domain size 1).
% 21.16/3.10
% 21.16/3.10 The encoding turns the above axioms into the following unit equations and goals:
% 21.16/3.10
% 21.16/3.10 Axiom 1 (a_is_defined): defined(a) = true.
% 21.16/3.10 Axiom 2 (less_or_equal_4): less_or_equal(a, b) = true.
% 21.16/3.10 Axiom 3 (existence_of_inverse_addition): fresh12(X, X, Y) = true.
% 21.16/3.10 Axiom 4 (sum_5): sum(b, additive_inverse(a), u) = true.
% 21.16/3.10 Axiom 5 (compatibility_of_order_relation_and_addition): fresh28(X, X, Y, Z) = true.
% 21.16/3.10 Axiom 6 (existence_of_inverse_addition): fresh12(defined(X), true, X) = sum(additive_inverse(X), X, additive_identity).
% 21.16/3.10 Axiom 7 (commutativity_addition): fresh18(X, X, Y, Z, W) = true.
% 21.16/3.10 Axiom 8 (compatibility_of_order_relation_and_addition): fresh16(X, X, Y, Z, W, V) = less_or_equal(Y, Z).
% 21.16/3.10 Axiom 9 (compatibility_of_order_relation_and_addition): fresh27(X, X, Y, Z, W, V, U) = fresh28(sum(W, U, Y), true, Y, Z).
% 21.16/3.10 Axiom 10 (commutativity_addition): fresh18(sum(X, Y, Z), true, Y, X, Z) = sum(Y, X, Z).
% 21.16/3.10 Axiom 11 (compatibility_of_order_relation_and_addition): fresh27(less_or_equal(X, Y), true, Z, W, X, Y, V) = fresh16(sum(Y, V, W), true, Z, W, X, V).
% 21.16/3.10
% 21.16/3.10 Goal 1 (not_less_or_equal_6): less_or_equal(additive_identity, u) = true.
% 21.16/3.10 Proof:
% 21.16/3.10 less_or_equal(additive_identity, u)
% 21.16/3.10 = { by axiom 8 (compatibility_of_order_relation_and_addition) R->L }
% 21.16/3.10 fresh16(true, true, additive_identity, u, a, additive_inverse(a))
% 21.16/3.10 = { by axiom 4 (sum_5) R->L }
% 21.16/3.10 fresh16(sum(b, additive_inverse(a), u), true, additive_identity, u, a, additive_inverse(a))
% 21.16/3.10 = { by axiom 11 (compatibility_of_order_relation_and_addition) R->L }
% 21.16/3.10 fresh27(less_or_equal(a, b), true, additive_identity, u, a, b, additive_inverse(a))
% 21.16/3.10 = { by axiom 2 (less_or_equal_4) }
% 21.16/3.10 fresh27(true, true, additive_identity, u, a, b, additive_inverse(a))
% 21.16/3.10 = { by axiom 9 (compatibility_of_order_relation_and_addition) }
% 21.16/3.10 fresh28(sum(a, additive_inverse(a), additive_identity), true, additive_identity, u)
% 21.16/3.10 = { by axiom 10 (commutativity_addition) R->L }
% 21.16/3.10 fresh28(fresh18(sum(additive_inverse(a), a, additive_identity), true, a, additive_inverse(a), additive_identity), true, additive_identity, u)
% 21.16/3.10 = { by axiom 6 (existence_of_inverse_addition) R->L }
% 21.16/3.10 fresh28(fresh18(fresh12(defined(a), true, a), true, a, additive_inverse(a), additive_identity), true, additive_identity, u)
% 21.16/3.10 = { by axiom 1 (a_is_defined) }
% 21.16/3.10 fresh28(fresh18(fresh12(true, true, a), true, a, additive_inverse(a), additive_identity), true, additive_identity, u)
% 21.16/3.10 = { by axiom 3 (existence_of_inverse_addition) }
% 21.16/3.10 fresh28(fresh18(true, true, a, additive_inverse(a), additive_identity), true, additive_identity, u)
% 21.16/3.10 = { by axiom 7 (commutativity_addition) }
% 21.16/3.10 fresh28(true, true, additive_identity, u)
% 21.16/3.10 = { by axiom 5 (compatibility_of_order_relation_and_addition) }
% 21.16/3.10 true
% 21.16/3.10 % SZS output end Proof
% 21.16/3.10
% 21.16/3.10 RESULT: Unsatisfiable (the axioms are contradictory).
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