reserve x for set;
reserve a,b,d,ra,rb,r0,s1,s2 for Real;
reserve r,s,r1,r2,r3,rc for Real;
reserve p,q,q1,q2 for Point of TOP-REAL 2;
reserve X,Y,Z for non empty TopSpace;

theorem Th2:
  for ra,rb st ra<=rb holds [#](Closed-Interval-TSpace(ra,rb)) is connected
proof
  let ra,rb;
  assume ra<=rb;
  then Closed-Interval-TSpace(ra,rb) is connected by TREAL_1:20;
  hence thesis by CONNSP_1:27;
end;
