let p be Point of (TOP-REAL 2); ( p <> 0. (TOP-REAL 2) implies ( ( ( ( p `1 <= p `2 & - (p `2) <= p `1 ) or ( p `1 >= p `2 & p `1 <= - (p `2) ) ) implies Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]| ) & ( ( p `1 <= p `2 & - (p `2) <= p `1 ) or ( p `1 >= p `2 & p `1 <= - (p `2) ) or Out_In_Sq . p = |[(1 / (p `1)),(((p `2) / (p `1)) / (p `1))]| ) ) )
assume A1:
p <> 0. (TOP-REAL 2)
; ( ( ( ( p `1 <= p `2 & - (p `2) <= p `1 ) or ( p `1 >= p `2 & p `1 <= - (p `2) ) ) implies Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]| ) & ( ( p `1 <= p `2 & - (p `2) <= p `1 ) or ( p `1 >= p `2 & p `1 <= - (p `2) ) or Out_In_Sq . p = |[(1 / (p `1)),(((p `2) / (p `1)) / (p `1))]| ) )
hereby ( ( p `1 <= p `2 & - (p `2) <= p `1 ) or ( p `1 >= p `2 & p `1 <= - (p `2) ) or Out_In_Sq . p = |[(1 / (p `1)),(((p `2) / (p `1)) / (p `1))]| )
assume A2:
( (
p `1 <= p `2 &
- (p `2) <= p `1 ) or (
p `1 >= p `2 &
p `1 <= - (p `2) ) )
;
Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]|now ( ( p `1 <= p `2 & - (p `2) <= p `1 & Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]| ) or ( p `1 >= p `2 & p `1 <= - (p `2) & Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]| ) )per cases
( ( p `1 <= p `2 & - (p `2) <= p `1 ) or ( p `1 >= p `2 & p `1 <= - (p `2) ) )
by A2;
case A3:
(
p `1 <= p `2 &
- (p `2) <= p `1 )
;
Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]|now ( ( ( p `2 <= p `1 & - (p `1) <= p `2 ) or ( p `2 >= p `1 & p `2 <= - (p `1) ) ) implies Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]| )assume A4:
( (
p `2 <= p `1 &
- (p `1) <= p `2 ) or (
p `2 >= p `1 &
p `2 <= - (p `1) ) )
;
Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]|now ( ( p `1 = p `2 & Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]| ) or ( p `1 = - (p `2) & Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]| ) )per cases
( p `1 = p `2 or p `1 = - (p `2) )
by A5;
case A7:
p `1 = - (p `2)
;
Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]|then A8:
p `2 <> 0
by A1, EUCLID:53, EUCLID:54;
A9:
((p `1) / (p `2)) / (p `2) =
(- ((p `2) / (p `2))) / (p `2)
by A7
.=
(- 1) / (p `2)
by A8, XCMPLX_1:60
.=
1
/ (p `1)
by A7, XCMPLX_1:192
;
- (p `1) = p `2
by A7;
then 1
/ (p `2) =
- (1 / (p `1))
by XCMPLX_1:188
.=
- (((p `2) / (p `1)) / (- (p `1)))
by A7, A9, XCMPLX_1:192
.=
- (- (((p `2) / (p `1)) / (p `1)))
by XCMPLX_1:188
.=
((p `2) / (p `1)) / (p `1)
;
hence
Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]|
by A1, A4, A9, Def1;
verum end; end; end; hence
Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]|
;
verum end; hence
Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]|
by A1, Def1;
verum end; case A10:
(
p `1 >= p `2 &
p `1 <= - (p `2) )
;
Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]|now ( ( ( p `2 <= p `1 & - (p `1) <= p `2 ) or ( p `2 >= p `1 & p `2 <= - (p `1) ) ) implies Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]| )assume A11:
( (
p `2 <= p `1 &
- (p `1) <= p `2 ) or (
p `2 >= p `1 &
p `2 <= - (p `1) ) )
;
Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]|now ( ( p `1 = p `2 & Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]| ) or ( p `1 = - (p `2) & Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]| ) )per cases
( p `1 = p `2 or p `1 = - (p `2) )
by A12;
case A14:
p `1 = - (p `2)
;
Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]|then A15:
p `2 <> 0
by A1, EUCLID:53, EUCLID:54;
A16:
((p `1) / (p `2)) / (p `2) =
(- ((p `2) / (p `2))) / (p `2)
by A14
.=
(- 1) / (p `2)
by A15, XCMPLX_1:60
.=
1
/ (p `1)
by A14, XCMPLX_1:192
;
- (p `1) = p `2
by A14;
then 1
/ (p `2) =
- (((p `1) / (p `2)) / (p `2))
by A16, XCMPLX_1:188
.=
- (((p `2) / (p `1)) / (- (p `1)))
by A14, XCMPLX_1:191
.=
- (- (((p `2) / (p `1)) / (p `1)))
by XCMPLX_1:188
.=
((p `2) / (p `1)) / (p `1)
;
hence
Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]|
by A1, A11, A16, Def1;
verum end; end; end; hence
Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]|
;
verum end; hence
Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]|
by A1, Def1;
verum end; end; end; hence
Out_In_Sq . p = |[(((p `1) / (p `2)) / (p `2)),(1 / (p `2))]|
;
verum
end;