let n be Nat; :: thesis: for C being compact non horizontal non vertical Subset of (TOP-REAL 2) holds Upper_Seq (C,n) is_in_the_area_of Cage (C,n)
let C be compact non horizontal non vertical Subset of (TOP-REAL 2); :: thesis: Upper_Seq (C,n) is_in_the_area_of Cage (C,n)
E-max (L~ (Cage (C,n))) in rng (Cage (C,n)) by SPRECT_2:46;
then E-max (L~ (Cage (C,n))) in rng (Rotate ((Cage (C,n)),(W-min (L~ (Cage (C,n)))))) by FINSEQ_6:90, SPRECT_2:43;
hence Upper_Seq (C,n) is_in_the_area_of Cage (C,n) by Th1, JORDAN1B:10; :: thesis: verum