Connectedness of GL(n,R)^+, Connectedness of GL(n,C), SL(n,C), SL(n,R), Hausdorff topological spaces, Compactness.
SO(n) is connected, Compact metric spaces, Lebesgue Number Lemma, Locally compact spaces.
One point compactification, One point compactification (continued), Uniqueness of one point compatification, Quotient topology, Quotient topology on G/H.
Grassmannian, Normal topological spaces, Urysohn’s Lemma, Tietze Extension Theorem, Regular and Second Countable spaces, Urysohn’s Metrization Theorem.