reserve m,n,i,i2,j for Nat,
  r,r1,r2,s,t for Real,
  x,y,z for object;
reserve p,p1,p2,p3,q,q1,q2,q3,q4 for Point of TOP-REAL n;
reserve u for Point of Euclid n;
reserve R for Subset of TOP-REAL n;
reserve P,Q for Subset of TOP-REAL n;
reserve D for non vertical non horizontal non empty compact Subset of TOP-REAL
  2;
reserve f for clockwise_oriented non constant standard
  special_circular_sequence;
reserve p for Point of TOP-REAL 2;

theorem Th108:
  for C being compact Subset of TOP-REAL 2 holds UBD C is_a_component_of C`
proof
  let C be compact Subset of TOP-REAL 2;
  UBD C is_outside_component_of C by Th53;
  hence thesis;
end;
