theorem Th14:
  (ex C be Subset of TOP-REAL 2 st (C is_a_component_of (L~f)` & a
in C & b in C)) iff ( a in RightComp f & b in RightComp f or a in LeftComp f &
  b in LeftComp f )
by JORDAN1H:24,GOBOARD9:def 1,GOBOARD9:def 2;
