I had a dream abt u! we were in a group of ppl in a class watching a movie & I was sitting next to u, & u kept falling asleep like in ur end screen, but u smiled at me when I checked in with u. cutie

so here's the thing about an open set. you take any point x in it, and there's a ball centered on x that is also contained in the set! neat, right? the set of all open sets is the topology btw haha

Whoever told you that is a traitor and should be punished