↑ Up

E---3.5.1.THM-CRf.s

View TPTP
Problem
Process solution in
SystemOnTSTP
Download .tgz
%------------------------------------------------------------------------------
% File     : E---3.5.1
% Problem  : SET994+1 : TPTP v9.3.1. Released v3.2.0.
% Transfm  : none
% Format   : tptp:raw
% Command  : run_E /export/starexec/sandbox2/benchmark/theBenchmark.p 300 THM

% Computer : n009.cluster.edu
% Model    : x86_64 x86_64
% CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 2.10GHz
% Memory   : 8046.5625MB
% OS       : Linux 6.8.0-71-generic
% CPULimit : 300s
% WCLimit  : 300s
% DateTime : Thu Sep 24 02:15:55 PM UTC 2026

% Result   : Theorem 0.15s 0.65s
% Output   : CNFRefutation 0.15s
% Verified : 
% SZS Type : Refutation
%            Derivation depth      :    9
%            Number of leaves      :   11
% Syntax   : Number of formulae    :   55 (  23 unt;   0 def)
%            Number of atoms       :  135 (  41 equ)
%            Maximal formula atoms :    8 (   2 avg)
%            Number of connectives :  129 (  49   ~;  40   |;  25   &)
%                                         (   0 <=>;  15  =>;   0  <=;   0 <~>)
%            Maximal formula depth :   11 (   3 avg)
%            Maximal term depth    :    3 (   1 avg)
%            Number of predicates  :    8 (   6 usr;   1 prp; 0-2 aty)
%            Number of functors    :    9 (   9 usr;   4 con; 0-2 aty)
%            Number of variables   :   59 (   5 sgn  29   !;   3   ?)

% Comments : 
%------------------------------------------------------------------------------
fof(t16_funct_1,conjecture,
    ! [X1] :
      ( ! [X2] :
          ( ( function(X2)
            & relation(X2) )
         => ! [X3] :
              ( ( function(X3)
                & relation(X3) )
             => ( ( relation_dom(X3) = X1
                  & relation_dom(X2) = X1 )
               => X2 = X3 ) ) )
     => X1 = empty_set ),
    file('/export/starexec/sandbox2/benchmark/theBenchmark.p',t16_funct_1) ).

fof(t6_boole,axiom,
    ! [X1] :
      ( empty(X1)
     => X1 = empty_set ),
    file('/export/starexec/sandbox2/benchmark/theBenchmark.p',t6_boole) ).

fof(s3_funct_1__e7_14__funct_1,axiom,
    ! [X1] :
    ? [X2] :
      ( ! [X3] :
          ( in(X3,X1)
         => apply(X2,X3) = n1 )
      & relation_dom(X2) = X1
      & function(X2)
      & relation(X2) ),
    file('/export/starexec/sandbox2/benchmark/theBenchmark.p',s3_funct_1__e7_14__funct_1) ).

fof(fc7_relat_1,axiom,
    ! [X1] :
      ( empty(X1)
     => ( relation(relation_dom(X1))
        & empty(relation_dom(X1)) ) ),
    file('/export/starexec/sandbox2/benchmark/theBenchmark.p',fc7_relat_1) ).

fof(s3_funct_1__e4_14__funct_1,axiom,
    ! [X1] :
    ? [X2] :
      ( ! [X3] :
          ( in(X3,X1)
         => apply(X2,X3) = n0 )
      & relation_dom(X2) = X1
      & function(X2)
      & relation(X2) ),
    file('/export/starexec/sandbox2/benchmark/theBenchmark.p',s3_funct_1__e4_14__funct_1) ).

fof(spc0_boole,axiom,
    empty(n0),
    file('/export/starexec/sandbox2/benchmark/theBenchmark.p',spc0_boole) ).

fof(fc5_relat_1,axiom,
    ! [X1] :
      ( ( relation(X1)
        & ~ empty(X1) )
     => ~ empty(relation_dom(X1)) ),
    file('/export/starexec/sandbox2/benchmark/theBenchmark.p',fc5_relat_1) ).

fof(t2_subset,axiom,
    ! [X1,X2] :
      ( element(X1,X2)
     => ( in(X1,X2)
        | empty(X2) ) ),
    file('/export/starexec/sandbox2/benchmark/theBenchmark.p',t2_subset) ).

fof(existence_m1_subset_1,axiom,
    ! [X1] :
    ? [X2] : element(X2,X1),
    file('/export/starexec/sandbox2/benchmark/theBenchmark.p',existence_m1_subset_1) ).

fof(spc1_boole,axiom,
    ~ empty(n1),
    file('/export/starexec/sandbox2/benchmark/theBenchmark.p',spc1_boole) ).

fof(fc12_relat_1,axiom,
    ( relation_empty_yielding(empty_set)
    & relation(empty_set)
    & empty(empty_set) ),
    file('/export/starexec/sandbox2/benchmark/theBenchmark.p',fc12_relat_1) ).

fof(c_0_11,negated_conjecture,
    ~ ! [X1] :
        ( ! [X2] :
            ( ( function(X2)
              & relation(X2) )
           => ! [X3] :
                ( ( function(X3)
                  & relation(X3) )
               => ( ( relation_dom(X3) = X1
                    & relation_dom(X2) = X1 )
                 => X2 = X3 ) ) )
       => X1 = empty_set ),
    inference(assume_negation,[status(cth)],[t16_funct_1]) ).

fof(c_0_12,plain,
    ! [X45] :
      ( X45 = empty_set
      | ~ empty(X45) ),
    inference(fof_nnf,[status(thm)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[t6_boole])])]) ).

fof(c_0_13,negated_conjecture,
    ! [X31,X32] :
      ( esk12_0 != empty_set
      & ( X31 = X32
        | relation_dom(X32) != esk12_0
        | relation_dom(X31) != esk12_0
        | ~ function(X32)
        | ~ relation(X32)
        | ~ function(X31)
        | ~ relation(X31) ) ),
    inference(fof_nnf,[status(thm)],[inference(shift_quantors,[status(thm)],[inference(skolemize,[status(esa)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[c_0_11])])])])]) ).

fof(c_0_14,plain,
    ! [X27,X29] :
      ( ( apply(esk11_1(X27),X29) = n1
        | ~ in(X29,X27) )
      & relation_dom(esk11_1(X27)) = X27
      & function(esk11_1(X27))
      & relation(esk11_1(X27)) ),
    inference(fof_nnf,[status(thm)],[inference(shift_quantors,[status(thm)],[inference(skolemize,[status(esa)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[s3_funct_1__e7_14__funct_1])])])])]) ).

fof(c_0_15,plain,
    ! [X12] :
      ( ( ~ empty(X12)
        | relation(relation_dom(X12)) )
      & ( ~ empty(X12)
        | empty(relation_dom(X12)) ) ),
    inference(distribute,[status(thm)],[inference(fof_nnf,[status(thm)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[fc7_relat_1])])])]) ).

fof(c_0_16,plain,
    ! [X24,X26] :
      ( ( apply(esk10_1(X24),X26) = n0
        | ~ in(X26,X24) )
      & relation_dom(esk10_1(X24)) = X24
      & function(esk10_1(X24))
      & relation(esk10_1(X24)) ),
    inference(fof_nnf,[status(thm)],[inference(shift_quantors,[status(thm)],[inference(skolemize,[status(esa)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[s3_funct_1__e4_14__funct_1])])])])]) ).

cnf(c_0_17,plain,
    ( ~ empty(X1)
    | X1 = empty_set ),
    inference(split_conjunct,[status(thm)],[c_0_12]) ).

cnf(c_0_18,plain,
    empty(n0),
    inference(split_conjunct,[status(thm)],[spc0_boole]) ).

cnf(c_0_19,negated_conjecture,
    ( relation_dom(X2) != esk12_0
    | relation_dom(X1) != esk12_0
    | ~ function(X2)
    | ~ relation(X2)
    | ~ function(X1)
    | ~ relation(X1)
    | X1 = X2 ),
    inference(split_conjunct,[status(thm)],[c_0_13]) ).

cnf(c_0_20,plain,
    relation_dom(esk11_1(X1)) = X1,
    inference(split_conjunct,[status(thm)],[c_0_14]) ).

cnf(c_0_21,plain,
    relation(esk11_1(X1)),
    inference(split_conjunct,[status(thm)],[c_0_14]) ).

cnf(c_0_22,plain,
    function(esk11_1(X1)),
    inference(split_conjunct,[status(thm)],[c_0_14]) ).

fof(c_0_23,plain,
    ! [X1] :
      ( ( relation(X1)
        & ~ empty(X1) )
     => ~ empty(relation_dom(X1)) ),
    inference(fof_simplification,[status(thm)],[fc5_relat_1]) ).

cnf(c_0_24,plain,
    ( ~ empty(X1)
    | empty(relation_dom(X1)) ),
    inference(split_conjunct,[status(thm)],[c_0_15]) ).

cnf(c_0_25,plain,
    ( ~ in(X1,X2)
    | apply(esk10_1(X2),X1) = n0 ),
    inference(split_conjunct,[status(thm)],[c_0_16]) ).

cnf(c_0_26,plain,
    n0 = empty_set,
    inference(spm,[status(thm)],[c_0_17,c_0_18]) ).

cnf(c_0_27,negated_conjecture,
    ( ~ function(X1)
    | ~ relation(X1)
    | relation_dom(X1) != esk12_0
    | X1 = esk11_1(esk12_0) ),
    inference(er,[status(thm)],[inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_19,c_0_20]),c_0_21]),c_0_22])])]) ).

cnf(c_0_28,plain,
    relation_dom(esk10_1(X1)) = X1,
    inference(split_conjunct,[status(thm)],[c_0_16]) ).

cnf(c_0_29,plain,
    relation(esk10_1(X1)),
    inference(split_conjunct,[status(thm)],[c_0_16]) ).

cnf(c_0_30,plain,
    function(esk10_1(X1)),
    inference(split_conjunct,[status(thm)],[c_0_16]) ).

fof(c_0_31,plain,
    ! [X11] :
      ( ~ empty(relation_dom(X11))
      | ~ relation(X11)
      | empty(X11) ),
    inference(fof_nnf,[status(thm)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[c_0_23])])]) ).

cnf(c_0_32,plain,
    ( ~ empty(X1)
    | relation_dom(X1) = empty_set ),
    inference(spm,[status(thm)],[c_0_17,c_0_24]) ).

cnf(c_0_33,plain,
    ( ~ in(X2,X1)
    | apply(esk10_1(X1),X2) = empty_set ),
    inference(rw,[status(thm)],[c_0_25,c_0_26]) ).

cnf(c_0_34,negated_conjecture,
    esk10_1(esk12_0) = esk11_1(esk12_0),
    inference(er,[status(thm)],[inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_27,c_0_28]),c_0_29]),c_0_30])])]) ).

fof(c_0_35,plain,
    ! [X35,X36] :
      ( in(X35,X36)
      | empty(X36)
      | ~ element(X35,X36) ),
    inference(fof_nnf,[status(thm)],[inference(variable_rename,[status(thm)],[inference(fof_nnf,[status(thm)],[t2_subset])])]) ).

fof(c_0_36,plain,
    ! [X8] : element(esk1_1(X8),X8),
    inference(skolemize,[status(esa)],[inference(variable_rename,[status(thm)],[existence_m1_subset_1])]) ).

cnf(c_0_37,plain,
    ( ~ empty(relation_dom(X1))
    | ~ relation(X1)
    | empty(X1) ),
    inference(split_conjunct,[status(thm)],[c_0_31]) ).

cnf(c_0_38,plain,
    ( ~ empty(esk10_1(X1))
    | empty_set = X1 ),
    inference(spm,[status(thm)],[c_0_28,c_0_32]) ).

cnf(c_0_39,negated_conjecture,
    esk12_0 != empty_set,
    inference(split_conjunct,[status(thm)],[c_0_13]) ).

fof(c_0_40,plain,
    ~ empty(n1),
    inference(fof_simplification,[status(thm)],[spc1_boole]) ).

cnf(c_0_41,plain,
    ( ~ in(X1,X2)
    | apply(esk11_1(X2),X1) = n1 ),
    inference(split_conjunct,[status(thm)],[c_0_14]) ).

cnf(c_0_42,negated_conjecture,
    ( ~ in(X1,esk12_0)
    | apply(esk11_1(esk12_0),X1) = empty_set ),
    inference(spm,[status(thm)],[c_0_33,c_0_34]) ).

cnf(c_0_43,plain,
    ( ~ element(X1,X2)
    | in(X1,X2)
    | empty(X2) ),
    inference(split_conjunct,[status(thm)],[c_0_35]) ).

cnf(c_0_44,plain,
    element(esk1_1(X1),X1),
    inference(split_conjunct,[status(thm)],[c_0_36]) ).

cnf(c_0_45,plain,
    ( ~ empty(X1)
    | empty(esk10_1(X1)) ),
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(spm,[status(thm)],[c_0_37,c_0_28]),c_0_29])]) ).

cnf(c_0_46,negated_conjecture,
    ~ empty(esk11_1(esk12_0)),
    inference(sr,[status(thm)],[inference(spm,[status(thm)],[c_0_38,c_0_34]),c_0_39]) ).

fof(c_0_47,plain,
    ~ empty(n1),
    inference(fof_nnf,[status(thm)],[c_0_40]) ).

cnf(c_0_48,negated_conjecture,
    ( ~ in(X1,esk12_0)
    | n1 = empty_set ),
    inference(spm,[status(thm)],[c_0_41,c_0_42]) ).

cnf(c_0_49,plain,
    ( in(esk1_1(X1),X1)
    | empty(X1) ),
    inference(spm,[status(thm)],[c_0_43,c_0_44]) ).

cnf(c_0_50,negated_conjecture,
    ~ empty(esk12_0),
    inference(sr,[status(thm)],[inference(spm,[status(thm)],[c_0_45,c_0_34]),c_0_46]) ).

cnf(c_0_51,plain,
    ~ empty(n1),
    inference(split_conjunct,[status(thm)],[c_0_47]) ).

cnf(c_0_52,negated_conjecture,
    n1 = empty_set,
    inference(sr,[status(thm)],[inference(spm,[status(thm)],[c_0_48,c_0_49]),c_0_50]) ).

cnf(c_0_53,plain,
    empty(empty_set),
    inference(split_conjunct,[status(thm)],[fc12_relat_1]) ).

cnf(c_0_54,plain,
    $false,
    inference(cn,[status(thm)],[inference(rw,[status(thm)],[inference(rw,[status(thm)],[c_0_51,c_0_52]),c_0_53])]),
    [proof] ).

%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.00/0.02  % Problem  : SET994+1 : TPTP v9.3.1. Released v3.2.0.
% 0.00/0.04  % Command  : run_E /export/starexec/sandbox2/benchmark/theBenchmark.p 300 THM
% 0.12/0.57  % Computer : n009.cluster.edu
% 0.12/0.57  % Model    : x86_64 x86_64
% 0.12/0.57  % CPU      : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.12/0.57  % Memory   : 8046.5625MB
% 0.12/0.57  % OS       : Linux 6.8.0-71-generic
% 0.12/0.58  % CPULimit : 300
% 0.12/0.58  % WCLimit  : 300
% 0.12/0.58  % DateTime : Mon Sep 21 05:46:29 UTC 2026
% 0.12/0.58  % CPUTime  : 
% 0.12/0.58  Running run_E /export/starexec/sandbox2/benchmark/theBenchmark.p 300 THM
% 0.12/0.62  Running first-order theorem proving
% 0.12/0.62  Running: /export/starexec/sandbox2/solver/bin/eprover --delete-bad-limit=2000000000 --definitional-cnf=24 -s --print-statistics -R --print-version --proof-object --auto-schedule=8 --cpu-limit=300 /export/starexec/sandbox2/benchmark/theBenchmark.p
% 0.15/0.65  % Version: 3.5.1
% 0.15/0.65  % Preprocessing class: FSMSSMSSSSSNFFN.
% 0.15/0.65  % Scheduled 4 strats onto 8 cores with 300 seconds (2400 total)
% 0.15/0.65  % Starting G-E--_208_C18_F1_SE_CS_SOS_SP_PS_S5PRR_RG_S04AN with 1500s (5) cores
% 0.15/0.65  % Starting new_bool_3 with 300s (1) cores
% 0.15/0.65  % Starting new_bool_1 with 300s (1) cores
% 0.15/0.65  % Starting sh5l with 300s (1) cores
% 0.15/0.65  % G-E--_208_C18_F1_SE_CS_SOS_SP_PS_S5PRR_RG_S04AN with pid 975615 completed with status 0
% 0.15/0.65  % Result found by G-E--_208_C18_F1_SE_CS_SOS_SP_PS_S5PRR_RG_S04AN
% 0.15/0.65  % Preprocessing class: FSMSSMSSSSSNFFN.
% 0.15/0.65  % Scheduled 4 strats onto 8 cores with 300 seconds (2400 total)
% 0.15/0.65  % Starting G-E--_208_C18_F1_SE_CS_SOS_SP_PS_S5PRR_RG_S04AN with 1500s (5) cores
% 0.15/0.65  % (lift_lambdas = 1, lambda_to_forall = 1,unroll_only_formulas = 1, sine = Auto)
% 0.15/0.65  % No SInE strategy applied
% 0.15/0.65  % Search class: FGHSM-FFMM21-SFFFFFNN
% 0.15/0.65  % Scheduled 7 strats onto 5 cores with 1500 seconds (1500 total)
% 0.15/0.65  % Starting SubtermCWHack with 136s (1) cores
% 0.15/0.65  % Starting G-E--_208_C18_F1_SE_CS_SOS_SP_PS_S5PRR_RG_S04AN with 151s (1) cores
% 0.15/0.65  % Starting G-E--_301_C18_F1_URBAN_S5PRR_RG_S04AN with 136s (1) cores
% 0.15/0.65  % Starting G-E--_301_C18_F1_URBAN_S5PRR_RG_S0Y with 136s (1) cores
% 0.15/0.65  % Starting G-E--_208_C09_12_F1_SE_CS_SP_PS_S5PRR_S04AN with 136s (1) cores
% 0.15/0.65  % G-E--_208_C18_F1_SE_CS_SOS_SP_PS_S5PRR_RG_S04AN with pid 975622 completed with status 0
% 0.15/0.65  % Result found by G-E--_208_C18_F1_SE_CS_SOS_SP_PS_S5PRR_RG_S04AN
% 0.15/0.65  % Preprocessing class: FSMSSMSSSSSNFFN.
% 0.15/0.65  % Scheduled 4 strats onto 8 cores with 300 seconds (2400 total)
% 0.15/0.65  % Starting G-E--_208_C18_F1_SE_CS_SOS_SP_PS_S5PRR_RG_S04AN with 1500s (5) cores
% 0.15/0.65  % (lift_lambdas = 1, lambda_to_forall = 1,unroll_only_formulas = 1, sine = Auto)
% 0.15/0.65  % No SInE strategy applied
% 0.15/0.65  % Search class: FGHSM-FFMM21-SFFFFFNN
% 0.15/0.65  % Scheduled 7 strats onto 5 cores with 1500 seconds (1500 total)
% 0.15/0.65  % Starting SubtermCWHack with 136s (1) cores
% 0.15/0.65  % Starting G-E--_208_C18_F1_SE_CS_SOS_SP_PS_S5PRR_RG_S04AN with 151s (1) cores
% 0.15/0.65  % Preprocessing time       : 0.001 s
% 0.15/0.65  % Presaturation interreduction done
% 0.15/0.65  
% 0.15/0.65  % Proof found!
% 0.15/0.65  % SZS status Theorem
% 0.15/0.65  % SZS output start CNFRefutation
% See solution above
% 0.15/0.65  % Parsed axioms                        : 32
% 0.15/0.65  % Removed by relevancy pruning/SinE    : 0
% 0.15/0.65  % Initial clauses                      : 50
% 0.15/0.65  % Removed in clause preprocessing      : 0
% 0.15/0.65  % Initial clauses in saturation        : 50
% 0.15/0.65  % Processed clauses                    : 173
% 0.15/0.65  % ...of these trivial                  : 3
% 0.15/0.65  % ...subsumed                          : 35
% 0.15/0.65  % ...remaining for further processing  : 135
% 0.15/0.65  % Other redundant clauses eliminated   : 4
% 0.15/0.65  % Clauses deleted for lack of memory   : 0
% 0.15/0.65  % Backward-subsumed                    : 0
% 0.15/0.65  % Backward-rewritten                   : 10
% 0.15/0.65  % Generated clauses                    : 142
% 0.15/0.65  % ...of the previous two non-redundant : 110
% 0.15/0.65  % ...aggressively subsumed             : 0
% 0.15/0.65  % Contextual simplify-reflections      : 0
% 0.15/0.65  % Paramodulations                      : 138
% 0.15/0.65  % Factorizations                       : 0
% 0.15/0.65  % NegExts                              : 0
% 0.15/0.65  % Equation resolutions                 : 4
% 0.15/0.65  % Disequality decompositions           : 0
% 0.15/0.65  % Total rewrite steps                  : 69
% 0.15/0.65  % ...of those cached                   : 45
% 0.15/0.65  % Propositional unsat checks           : 0
% 0.15/0.65  %    Propositional check models        : 0
% 0.15/0.65  %    Propositional check unsatisfiable : 0
% 0.15/0.65  %    Propositional clauses             : 0
% 0.15/0.65  %    Propositional clauses after purity: 0
% 0.15/0.65  %    Propositional unsat core size     : 0
% 0.15/0.65  %    Propositional preprocessing time  : 0.000
% 0.15/0.65  %    Propositional encoding time       : 0.000
% 0.15/0.65  %    Propositional solver time         : 0.000
% 0.15/0.65  %    Success case prop preproc time    : 0.000
% 0.15/0.65  %    Success case prop encoding time   : 0.000
% 0.15/0.65  %    Success case prop solver time     : 0.000
% 0.15/0.65  % Current number of processed clauses  : 78
% 0.15/0.65  %    Positive orientable unit clauses  : 28
% 0.15/0.65  %    Positive unorientable unit clauses: 0
% 0.15/0.65  %    Negative unit clauses             : 8
% 0.15/0.65  %    Non-unit-clauses                  : 42
% 0.15/0.65  % Current number of unprocessed clauses: 28
% 0.15/0.65  % ...number of literals in the above   : 108
% 0.15/0.65  % Current number of archived formulas  : 0
% 0.15/0.65  % Current number of archived clauses   : 57
% 0.15/0.65  % Clause-clause subsumption calls (NU) : 271
% 0.15/0.65  % Rec. Clause-clause subsumption calls : 226
% 0.15/0.65  % Non-unit clause-clause subsumptions  : 25
% 0.15/0.65  % Unit Clause-clause subsumption calls : 46
% 0.15/0.65  % Rewrite failures with RHS unbound    : 0
% 0.15/0.65  % BW rewrite match attempts            : 12
% 0.15/0.65  % BW rewrite match successes           : 7
% 0.15/0.65  % Condensation attempts                : 0
% 0.15/0.65  % Condensation successes               : 0
% 0.15/0.65  % Termbank termtop insertions          : 3757
% 0.15/0.65  % Search garbage collected termcells   : 425
% 0.15/0.65  
% 0.15/0.65  % -------------------------------------------------
% 0.15/0.65  % User time                : 0.009 s
% 0.15/0.65  % System time              : 0.002 s
% 0.15/0.65  % Total time               : 0.011 s
% 0.15/0.65  % Maximum resident set size: 3656 pages
% 0.15/0.65  
% 0.15/0.65  % -------------------------------------------------
% 0.15/0.65  % User time                : 0.027 s
% 0.15/0.65  % System time              : 0.014 s
% 0.15/0.65  % Total time               : 0.041 s
% 0.15/0.65  % Maximum resident set size: 4864 pages
% 0.15/0.65  % E exiting
%------------------------------------------------------------------------------