- #1
PsychonautQQ
- 784
- 10
So I'm trying to understand a small part in the proof about how every 1-manifold is triangulable.
Let G be contained in K and let x be a limit point of G. Let U be a neighborhood of K that intersects G in finitely many closed neighborhoods, thus U intersect G is closed in G and thus x is in G.
Not undestanding:
U intersect G is closed in G implies x is in G
Let G be contained in K and let x be a limit point of G. Let U be a neighborhood of K that intersects G in finitely many closed neighborhoods, thus U intersect G is closed in G and thus x is in G.
Not undestanding:
U intersect G is closed in G implies x is in G