theorem Th46:
  for G being BinContinuous TopaddGroup, F being closed Subset of G,
  a being Element of G holds a + F is closed
proof
  let G be BinContinuous TopaddGroup, F be closed Subset of G,
a be Element of G;
  a + F = (a+).:F by Th15;
  hence thesis by TOPS_2:58;
end;
