%------------------------------------------------------------------------------
% File     : SWV013-0 : TPTP v8.2.0. Released v5.2.0.
% Domain   : Software Verification
% Axioms   : Lists in Separation Logic
% Version  : [Nav11] axioms.
% English  : Axioms for proving entailments between separation logic formulas
%            with list predicates.

% Refs     : [BCO05] Berdine et al. (2005), Symbolic Execution with Separat
%          : [RN11]  Rybalchenko & Navarro Perez (2011), Separation Logic +
%          : [Nav11] Navarro Perez (2011), Email to Geoff Sutcliffe
% Source   : [Nav11]
% Names    : SepLogicLists [Nav11]

% Status   : Satisfiable
% Syntax   : Number of clauses     :   11 (   4 unt;   3 nHn;   9 RR)
%            Number of literals    :   21 (   8 equ;   9 neg)
%            Maximal clause size   :    3 (   1 avg)
%            Maximal term depth    :    5 (   2 avg)
%            Number of predicates  :    2 (   1 usr;   0 prp; 1-2 aty)
%            Number of functors    :    4 (   4 usr;   1 con; 0-2 aty)
%            Number of variables   :   38 (   9 sgn)
% SPC      : 

% Comments :
%------------------------------------------------------------------------------
%----S * T * Sigma = T * S * Sigma.
cnf(associative_commutative,axiom,
    sep(S,sep(T,Sigma)) = sep(T,sep(S,Sigma)) ).

%----lseg(X, X) * Sigma = Sigma.
cnf(normalization,axiom,
    sep(lseg(X,X),Sigma) = Sigma ).

%----next(nil, Y) * Sigma --> bot.
cnf(wellformedness_1,axiom,
    ~ heap(sep(next(nil,Y),Sigma)) ).

%----lseg(nil, Y) * Sigma --> Y = nil.
cnf(wellformedness_2,axiom,
    ( ~ heap(sep(lseg(nil,Y),Sigma))
    | Y = nil ) ).

%----next(X, Y) * next(X, Z) * Sigma --> bot.
cnf(wellformedness_3,axiom,
    ~ heap(sep(next(X,Y),sep(next(X,Z),Sigma))) ).

%----next(X, Y) * lseg(X, Z) * Sigma --> X = Z.
cnf(wellformedness_4,axiom,
    ( ~ heap(sep(next(X,Y),sep(lseg(X,Z),Sigma)))
    | X = Z ) ).

%----lseg(X, Y) * lseg(X, Z) * Sigma --> X = Y, X = Z.
cnf(wellformedness_5,axiom,
    ( ~ heap(sep(lseg(X,Y),sep(lseg(X,Z),Sigma)))
    | X = Y
    | X = Z ) ).

%----next(X, Z) * Sigma --> X = Z, lseg(X, Z) * Sigma. (REDUNDANT: U2 + NORM)
%cnf(unfolding_1,axiom,
%   ( ~ heap(sep(next(X, Z), Sigma))
%   | X = Z
%   | heap(sep(lseg(X, Z), Sigma)) )).

%----next(X, Y) * lseg(Y, Z) * Sigma --> X = Y, lseg(X, Z) * Sigma.
cnf(unfolding_2,axiom,
    ( ~ heap(sep(next(X,Y),sep(lseg(Y,Z),Sigma)))
    | X = Y
    | heap(sep(lseg(X,Z),Sigma)) ) ).

%----lseg(X, Y) * lseg(Y, nil) * Sigma --> lseg(X, nil) * Sigma.
cnf(unfolding_3,axiom,
    ( ~ heap(sep(lseg(X,Y),sep(lseg(Y,nil),Sigma)))
    | heap(sep(lseg(X,nil),Sigma)) ) ).

%----lseg(X, Y) * lseg(Y, Z) * next(Z, W) * Sigma --> 
%----    lseg(X, Z) * next(Z, W) * Sigma.
cnf(unfolding_4,axiom,
    ( ~ heap(sep(lseg(X,Y),sep(lseg(Y,Z),sep(next(Z,W),Sigma))))
    | heap(sep(lseg(X,Z),sep(next(Z,W),Sigma))) ) ).

%----lseg(X, Y) * lseg(Y, Z) * lseg(Z, W) * Sigma --> 
%----    Z = W, lseg(X, Z) * lseg(Z, W) * Sigma.
cnf(unfolding_5,axiom,
    ( ~ heap(sep(lseg(X,Y),sep(lseg(Y,Z),sep(lseg(Z,W),Sigma))))
    | Z = W
    | heap(sep(lseg(X,Z),sep(lseg(Z,W),Sigma))) ) ).

%------------------------------------------------------------------------------