TPTP Problem File: SYO448^1.p

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```%------------------------------------------------------------------------------
% File     : SYO448^1 : TPTP v8.1.2. Released v4.0.0.
% Domain   : Syntactic
% Problem  : Ted Sider's modal proposition logic theorem 57
% Version  : Especial.
% English  :

% Refs     : [Sid09] Sider (2009), Logic for Philosophy
% Source   : [Sid09]
% Names    :

% Status   : Theorem
% Rating   : 0.31 v8.1.0, 0.27 v7.5.0, 0.29 v7.4.0, 0.22 v7.2.0, 0.12 v7.1.0, 0.38 v7.0.0, 0.29 v6.4.0, 0.33 v6.3.0, 0.40 v6.2.0, 0.57 v6.1.0, 0.43 v5.5.0, 0.17 v5.4.0, 0.20 v5.3.0, 0.40 v5.2.0, 0.20 v5.1.0, 0.40 v5.0.0, 0.20 v4.1.0, 0.00 v4.0.1, 0.33 v4.0.0
% Syntax   : Number of formulae    :   74 (  33 unt;  37 typ;  33 def)
%            Number of atoms       :  120 (  38 equ;   0 cnn)
%            Maximal formula atoms :   14 (   3 avg)
%            Number of connectives :  147 (   5   ~;   5   |;   8   &; 121   @)
%                                         (   0 <=>;   8  =>;   0  <=;   0 <~>)
%            Maximal formula depth :    8 (   1 avg)
%            Number of types       :    3 (   1 usr)
%            Number of type conns  :  180 ( 180   >;   0   *;   0   +;   0  <<)
%            Number of symbols     :   42 (  40 usr;   5 con; 0-3 aty)
%            Number of variables   :   88 (  52   ^  30   !;   6   ?;  88   :)
% SPC      : TH0_THM_EQU_NAR

%------------------------------------------------------------------------------
%----Include axioms for Modal logic S5
include('Axioms/LCL013^0.ax').
include('Axioms/LCL013^6.ax').
%------------------------------------------------------------------------------
thf(p_type,type,
p: \$i > \$o ).

thf(q_type,type,
q: \$i > \$o ).

thf(prove,conjecture,
mvalid @ ( mor @ ( mbox_s5 @ ( mimplies @ ( mbox_s5 @ p ) @ ( mbox_s5 @ q ) ) ) @ ( mbox_s5 @ ( mimplies @ ( mbox_s5 @ q ) @ ( mbox_s5 @ p ) ) ) ) ).

%------------------------------------------------------------------------------
```