%------------------------------------------------------------------------------
% File : Lash---1.13
% Problem : NUM684^1 : TPTP v9.2.0. Released v3.7.0.
% Transfm : none
% Format : tptp:raw
% Command : lash -P picomus -M modes -p tstp -t %d %s
% Computer : n009.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 Oct 9 02:09:36 PM UTC 2025
% Result : Theorem 20.25s 20.54s
% Output : Proof 20.25s
% Verified :
% SZS Type : ERROR: Analysing output (MakeTreeStats fails)
% Comments :
%------------------------------------------------------------------------------
thf(ty_nat,type,
nat: $tType ).
thf(ty_x,type,
x: nat ).
thf(ty_pl,type,
pl: nat > nat > nat ).
thf(ty_y,type,
y: nat ).
thf(ty_z,type,
z: nat ).
thf(sP1,plain,
( sP1
<=> ! [X1: nat,X2: nat] :
( ( pl @ X1 @ X2 )
= ( pl @ X2 @ X1 ) ) ),
introduced(definition,[new_symbols(definition,[sP1])]) ).
thf(sP2,plain,
( sP2
<=> ( ( ( pl @ x @ z )
= ( pl @ y @ z ) )
=> ( x = y ) ) ),
introduced(definition,[new_symbols(definition,[sP2])]) ).
thf(sP3,plain,
( sP3
<=> ( ( pl @ x @ z )
= ( pl @ y @ z ) ) ),
introduced(definition,[new_symbols(definition,[sP3])]) ).
thf(sP4,plain,
( sP4
<=> ( ( pl @ z @ y )
= ( pl @ y @ z ) ) ),
introduced(definition,[new_symbols(definition,[sP4])]) ).
thf(sP5,plain,
( sP5
<=> ! [X1: nat] :
( ( ( pl @ x @ X1 )
= ( pl @ y @ X1 ) )
=> ( x = y ) ) ),
introduced(definition,[new_symbols(definition,[sP5])]) ).
thf(sP6,plain,
( sP6
<=> ! [X1: nat,X2: nat,X3: nat] :
( ( ( pl @ X1 @ X3 )
= ( pl @ X2 @ X3 ) )
=> ( X1 = X2 ) ) ),
introduced(definition,[new_symbols(definition,[sP6])]) ).
thf(sP7,plain,
( sP7
<=> ( x = y ) ),
introduced(definition,[new_symbols(definition,[sP7])]) ).
thf(sP8,plain,
( sP8
<=> ! [X1: nat,X2: nat] :
( ( ( pl @ x @ X2 )
= ( pl @ X1 @ X2 ) )
=> ( x = X1 ) ) ),
introduced(definition,[new_symbols(definition,[sP8])]) ).
thf(sP9,plain,
( sP9
<=> ! [X1: nat] :
( ( pl @ z @ X1 )
= ( pl @ X1 @ z ) ) ),
introduced(definition,[new_symbols(definition,[sP9])]) ).
thf(sP10,plain,
( sP10
<=> ( ( pl @ z @ x )
= ( pl @ z @ y ) ) ),
introduced(definition,[new_symbols(definition,[sP10])]) ).
thf(sP11,plain,
( sP11
<=> ( ( pl @ z @ x )
= ( pl @ x @ z ) ) ),
introduced(definition,[new_symbols(definition,[sP11])]) ).
thf(satz20e,conjecture,
sP7 ).
thf(h0,negated_conjecture,
~ sP7,
inference(assume_negation,[status(cth)],[satz20e]) ).
thf(1,plain,
( ~ sP10
| sP3
| ~ sP11
| ~ sP4 ),
inference(confrontation_rule,[status(thm)],[]) ).
thf(2,plain,
( ~ sP2
| ~ sP3
| sP7 ),
inference(prop_rule,[status(thm)],[]) ).
thf(3,plain,
( ~ sP5
| sP2 ),
inference(all_rule,[status(thm)],[]) ).
thf(4,plain,
( ~ sP9
| sP4 ),
inference(all_rule,[status(thm)],[]) ).
thf(5,plain,
( ~ sP9
| sP11 ),
inference(all_rule,[status(thm)],[]) ).
thf(6,plain,
( ~ sP8
| sP5 ),
inference(all_rule,[status(thm)],[]) ).
thf(7,plain,
( ~ sP1
| sP9 ),
inference(all_rule,[status(thm)],[]) ).
thf(8,plain,
( ~ sP6
| sP8 ),
inference(all_rule,[status(thm)],[]) ).
thf(i,axiom,
sP10 ).
thf(satz20b,axiom,
sP6 ).
thf(satz6,axiom,
sP1 ).
thf(9,plain,
$false,
inference(prop_unsat,[status(thm),assumptions([h0])],[1,2,3,4,5,6,7,8,i,satz20b,satz6,h0]) ).
thf(0,theorem,
sP7,
inference(contra,[status(thm),contra(discharge,[h0])],[9,h0]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.03/0.12 % Problem : NUM684^1 : TPTP v9.2.0. Released v3.7.0.
% 0.03/0.12 % Command : lash -P picomus -M modes -p tstp -t %d %s
% 0.12/0.33 % Computer : n009.cluster.edu
% 0.12/0.33 % Model : x86_64 x86_64
% 0.12/0.33 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.12/0.33 % Memory : 8042.1875MB
% 0.12/0.33 % OS : Linux 3.10.0-693.el7.x86_64
% 0.12/0.33 % CPULimit : 300
% 0.12/0.33 % WCLimit : 300
% 0.12/0.33 % DateTime : Wed Oct 8 22:12:38 EDT 2025
% 0.12/0.33 % CPUTime :
% 20.25/20.54 % SZS status Theorem
% 20.25/20.54 % Mode: cade22grackle2x798d
% 20.25/20.54 % Steps: 837
% 20.25/20.54 % SZS output start Proof
% See solution above
%------------------------------------------------------------------------------