%------------------------------------------------------------------------------
% File : Lash---1.13
% Problem : NUM021^1 : TPTP v9.2.0. Released v3.6.0.
% Transfm : none
% Format : tptp:raw
% Command : lash -P picomus -M modes -p tstp -t %d %s
% Computer : n024.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 02:08:29 PM UTC 2025
% Result : Theorem 0.42s 0.80s
% Output : Proof 0.42s
% Verified :
% SZS Type : ERROR: Analysing output (MakeTreeStats fails)
% Comments :
%------------------------------------------------------------------------------
thf(sP1,plain,
( sP1
<=> $false ),
introduced(definition,[new_symbols(definition,[sP1])]) ).
thf(sP2,plain,
( sP2
<=> ! [X1: ( ( $i > $i ) > $i > $i ) > ( ( $i > $i ) > $i > $i ) > ( $i > $i ) > $i > $i] :
( ( ( X1
@ ^ [X2: $i > $i,X3: $i] : ( X2 @ ( X2 @ X3 ) )
@ ^ [X2: $i > $i,X3: $i] : ( X2 @ ( X2 @ ( X2 @ X3 ) ) ) )
= ( ^ [X2: $i > $i,X3: $i] : ( X2 @ ( X2 @ ( X2 @ ( X2 @ ( X2 @ X3 ) ) ) ) ) ) )
=> ( ( X1
@ ^ [X2: $i > $i] : X2
@ ^ [X2: $i > $i,X3: $i] : ( X2 @ ( X2 @ X3 ) ) )
!= ( ^ [X2: $i > $i,X3: $i] : ( X2 @ ( X2 @ ( X2 @ X3 ) ) ) ) ) ) ),
introduced(definition,[new_symbols(definition,[sP2])]) ).
thf(def_zero,definition,
( zero
= ( ^ [X1: $i > $i,X2: $i] : X2 ) ) ).
thf(def_one,definition,
( one
= ( ^ [X1: $i > $i,X2: $i] : ( X1 @ X2 ) ) ) ).
thf(def_two,definition,
( two
= ( ^ [X1: $i > $i,X2: $i] : ( X1 @ ( X1 @ X2 ) ) ) ) ).
thf(def_three,definition,
( three
= ( ^ [X1: $i > $i,X2: $i] : ( X1 @ ( X1 @ ( X1 @ X2 ) ) ) ) ) ).
thf(def_four,definition,
( four
= ( ^ [X1: $i > $i,X2: $i] : ( X1 @ ( X1 @ ( X1 @ ( X1 @ X2 ) ) ) ) ) ) ).
thf(def_five,definition,
( five
= ( ^ [X1: $i > $i,X2: $i] : ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ X2 ) ) ) ) ) ) ) ).
thf(def_six,definition,
( six
= ( ^ [X1: $i > $i,X2: $i] : ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ X2 ) ) ) ) ) ) ) ) ).
thf(def_seven,definition,
( seven
= ( ^ [X1: $i > $i,X2: $i] : ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ X2 ) ) ) ) ) ) ) ) ) ).
thf(def_eight,definition,
( eight
= ( ^ [X1: $i > $i,X2: $i] : ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ X2 ) ) ) ) ) ) ) ) ) ) ).
thf(def_nine,definition,
( nine
= ( ^ [X1: $i > $i,X2: $i] : ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ X2 ) ) ) ) ) ) ) ) ) ) ) ).
thf(def_ten,definition,
( ten
= ( ^ [X1: $i > $i,X2: $i] : ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ ( X1 @ X2 ) ) ) ) ) ) ) ) ) ) ) ) ).
thf(def_succ,definition,
( succ
= ( ^ [X1: ( $i > $i ) > $i > $i,X2: $i > $i,X3: $i] : ( X2 @ ( X1 @ X2 @ X3 ) ) ) ) ).
thf(def_plus,definition,
( plus
= ( ^ [X1: ( $i > $i ) > $i > $i,X2: ( $i > $i ) > $i > $i,X3: $i > $i,X4: $i] : ( X1 @ X3 @ ( X2 @ X3 @ X4 ) ) ) ) ).
thf(def_mult,definition,
( mult
= ( ^ [X1: ( $i > $i ) > $i > $i,X2: ( $i > $i ) > $i > $i,X3: $i > $i,X4: $i] : ( X1 @ ( X2 @ X3 ) @ X4 ) ) ) ).
thf(thm,conjecture,
~ sP2 ).
thf(h0,negated_conjecture,
sP2,
inference(assume_negation,[status(cth)],[thm]) ).
thf(1,plain,
~ sP1,
inference(prop_rule,[status(thm)],[]) ).
thf(2,plain,
( ~ sP2
| sP1 ),
inference(all_rule,[status(thm)],[]) ).
thf(3,plain,
$false,
inference(prop_unsat,[status(thm),assumptions([h0])],[1,2,h0]) ).
thf(0,theorem,
~ sP2,
inference(contra,[status(thm),contra(discharge,[h0])],[3,h0]) ).
%------------------------------------------------------------------------------
%----ORIGINAL SYSTEM OUTPUT
% 0.04/0.13 % Problem : NUM021^1 : TPTP v9.2.0. Released v3.6.0.
% 0.04/0.13 % Command : lash -P picomus -M modes -p tstp -t %d %s
% 0.13/0.35 % Computer : n024.cluster.edu
% 0.13/0.35 % Model : x86_64 x86_64
% 0.13/0.35 % CPU : Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
% 0.13/0.35 % Memory : 8042.1875MB
% 0.13/0.35 % OS : Linux 3.10.0-693.el7.x86_64
% 0.13/0.35 % CPULimit : 300
% 0.13/0.35 % WCLimit : 300
% 0.13/0.35 % DateTime : Wed Oct 8 22:16:08 EDT 2025
% 0.13/0.35 % CPUTime :
% 0.42/0.80 % SZS status Theorem
% 0.42/0.80 % Mode: cade22grackle2xfee4
% 0.42/0.80 % Steps: 93273
% 0.42/0.80 % SZS output start Proof
% See solution above
%------------------------------------------------------------------------------