
theorem Th8:
  id I[01] is Path of 0[01], 1[01]
proof
  set f = id I[01];
  f.0 = 0[01] & f.1 = 1[01] by BORSUK_1:def 14,def 15,FUNCT_1:18;
  hence thesis by BORSUK_2:def 4;
end;
