theorem :: WAYBEL34:30, AK, 20.02.2006
  for T being TopStruct holds T|[#]T = the TopStruct of T
proof
  let T be TopStruct;
  the TopStruct of T is strict SubSpace of T & the carrier of T = [#]the
  TopStruct of T by Th2,PRE_TOPC:10;
  hence thesis by PRE_TOPC:def 5;
end;
