%------------------------------------------------------------------------------
% File     : Twee---2.4.2
% Problem  : PUZ063-2 : TPTP v8.1.2. Released v3.2.0.
% 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 : n023.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 13:24:09 EDT 2023

% Result   : Unsatisfiable 0.14s 0.38s
% Output   : Proof 0.14s
% Verified : 
% SZS Type : -

% Comments : 
%------------------------------------------------------------------------------
%----WARNING: Could not form TPTP format derivation
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.06/0.12  % Problem  : PUZ063-2 : TPTP v8.1.2. Released v3.2.0.
% 0.06/0.13  % 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 : n023.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 : Sat Aug 26 22:21:56 EDT 2023
% 0.14/0.35  % CPUTime  : 
% 0.14/0.38  Command-line arguments: --no-flatten-goal
% 0.14/0.38  
% 0.14/0.38  % SZS status Unsatisfiable
% 0.14/0.38  
% 0.14/0.38  % SZS output start Proof
% 0.14/0.38  Take the following subset of the input axioms:
% 0.14/0.38    fof(cls_Set_OUn__empty__left_0, axiom, ![V_y, T_a]: c_union(c_emptyset, V_y, T_a)=V_y).
% 0.14/0.38    fof(cls_conjecture_0, negated_conjecture, c_in(v_u, c_Mutil_Otiling(v_A, t_a), tc_set(t_a))).
% 0.14/0.38    fof(cls_conjecture_2, negated_conjecture, ~c_in(c_union(c_emptyset, v_u, t_a), c_Mutil_Otiling(v_A, t_a), tc_set(t_a))).
% 0.14/0.38  
% 0.14/0.38  Now clausify the problem and encode Horn clauses using encoding 3 of
% 0.14/0.38  http://www.cse.chalmers.se/~nicsma/papers/horn.pdf.
% 0.14/0.38  We repeatedly replace C & s=t => u=v by the two clauses:
% 0.14/0.38    fresh(y, y, x1...xn) = u
% 0.14/0.38    C => fresh(s, t, x1...xn) = v
% 0.14/0.38  where fresh is a fresh function symbol and x1..xn are the free
% 0.14/0.38  variables of u and v.
% 0.14/0.38  A predicate p(X) is encoded as p(X)=true (this is sound, because the
% 0.14/0.38  input problem has no model of domain size 1).
% 0.14/0.38  
% 0.14/0.38  The encoding turns the above axioms into the following unit equations and goals:
% 0.14/0.38  
% 0.14/0.38  Axiom 1 (cls_Set_OUn__empty__left_0): c_union(c_emptyset, X, Y) = X.
% 0.14/0.38  Axiom 2 (cls_conjecture_0): c_in(v_u, c_Mutil_Otiling(v_A, t_a), tc_set(t_a)) = true.
% 0.14/0.38  
% 0.14/0.38  Goal 1 (cls_conjecture_2): c_in(c_union(c_emptyset, v_u, t_a), c_Mutil_Otiling(v_A, t_a), tc_set(t_a)) = true.
% 0.14/0.38  Proof:
% 0.14/0.38    c_in(c_union(c_emptyset, v_u, t_a), c_Mutil_Otiling(v_A, t_a), tc_set(t_a))
% 0.14/0.38  = { by axiom 1 (cls_Set_OUn__empty__left_0) }
% 0.14/0.38    c_in(v_u, c_Mutil_Otiling(v_A, t_a), tc_set(t_a))
% 0.14/0.38  = { by axiom 2 (cls_conjecture_0) }
% 0.14/0.38    true
% 0.14/0.38  % SZS output end Proof
% 0.14/0.38  
% 0.14/0.38  RESULT: Unsatisfiable (the axioms are contradictory).
%------------------------------------------------------------------------------