let P be non empty compact Subset of (TOP-REAL 2); :: thesis: for q1, q2 being Point of (TOP-REAL 2) st P is being_simple_closed_curve & q1 <> W-min P & q2 <> W-min P holds
not W-min P in Segment q1,q2,P
let q1, q2 be Point of (TOP-REAL 2); :: thesis: ( P is being_simple_closed_curve & q1 <> W-min P & q2 <> W-min P implies not W-min P in Segment q1,q2,P )
assume A1:
( P is being_simple_closed_curve & q1 <> W-min P & q2 <> W-min P )
; :: thesis: not W-min P in Segment q1,q2,P
then A2:
Segment q1,q2,P = { p where p is Point of (TOP-REAL 2) : ( LE q1,p,P & LE p,q2,P ) }
by Def1;
now assume
W-min P in Segment q1,
q2,
P
;
:: thesis: contradictionthen consider p being
Point of
(TOP-REAL 2) such that A3:
(
p = W-min P &
LE q1,
p,
P &
LE p,
q2,
P )
by A2;
A4:
(
q1 in Upper_Arc P &
p in Upper_Arc P &
LE q1,
p,
Upper_Arc P,
W-min P,
E-max P )
by A3, JORDAN6:def 10;
Upper_Arc P is_an_arc_of W-min P,
E-max P
by A1, JORDAN6:def 8;
hence
contradiction
by A1, A3, A4, JORDAN6:69;
:: thesis: verum end;
hence
not W-min P in Segment q1,q2,P
; :: thesis: verum