:: TOPMETR2 semantic presentation
theorem Th1: :: TOPMETR2:1
theorem Th2: :: TOPMETR2:2
Lemma46:
for f, g being Function st f .: ((dom f) /\ (dom g)) c= rng g holds
(rng f) \ (rng g) c= rng (f +* g)
theorem Th3: :: TOPMETR2:3
theorem Th4: :: TOPMETR2:4
theorem Th5: :: TOPMETR2:5
theorem Th6: :: TOPMETR2:6