reserve E for compact non vertical non horizontal Subset of TOP-REAL 2,
  C for compact connected non vertical non horizontal Subset of TOP-REAL 2,
  G for Go-board,
  i, j, m, n for Nat,
  p for Point of TOP-REAL 2;

theorem Th11:
  for f be FinSequence holds Center f >= 1
proof
  let f be FinSequence;
  len f div 2 + 1 >= 0+1 by XREAL_1:6;
  hence thesis by JORDAN1A:def 1;
end;
