TPTP Problem File: NUM669^1.p
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% File : NUM669^1 : TPTP v9.0.0. Released v3.7.0.
% Domain : Number Theory
% Problem : Landau theorem 18b
% Version : Especial.
% English : more (suc x) x
% Refs : [Lan30] Landau (1930), Grundlagen der Analysis
% : [vBJ79] van Benthem Jutting (1979), Checking Landau's "Grundla
% : [Bro09] Brown (2009), Email to Geoff Sutcliffe
% Source : [Bro09]
% Names : satz18b [Lan30]
% Status : Theorem
% : Without extensionality : Theorem
% Rating : 0.00 v6.0.0, 0.14 v5.5.0, 0.17 v5.4.0, 0.20 v4.1.0, 0.00 v3.7.0
% Syntax : Number of formulae : 9 ( 3 unt; 6 typ; 0 def)
% Number of atoms : 3 ( 1 equ; 0 cnn)
% Maximal formula atoms : 1 ( 1 avg)
% Number of connectives : 10 ( 0 ~; 0 |; 0 &; 10 @)
% ( 0 <=>; 0 =>; 0 <=; 0 <~>)
% Maximal formula depth : 7 ( 4 avg)
% Number of types : 2 ( 1 usr)
% Number of type conns : 5 ( 5 >; 0 *; 0 +; 0 <<)
% Number of symbols : 6 ( 5 usr; 2 con; 0-2 aty)
% Number of variables : 3 ( 0 ^; 3 !; 0 ?; 3 :)
% SPC : TH0_THM_EQU_NAR
% Comments :
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thf(nat_type,type,
nat: $tType ).
thf(x,type,
x: nat ).
thf(more,type,
more: nat > nat > $o ).
thf(suc,type,
suc: nat > nat ).
thf(pl,type,
pl: nat > nat > nat ).
thf(n_1,type,
n_1: nat ).
thf(satz18,axiom,
! [Xx: nat,Xy: nat] : ( more @ ( pl @ Xx @ Xy ) @ Xx ) ).
thf(satz4a,axiom,
! [Xx: nat] :
( ( pl @ Xx @ n_1 )
= ( suc @ Xx ) ) ).
thf(satz18b,conjecture,
more @ ( suc @ x ) @ x ).
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