How to tex this symbol?

Question

I am wondering how to type those kinds of symbols in LATEX. Please help me.

some professors use it to represent closed sets

some professors use it to represent open sets

Thank you very much!

Have you seen How to look up a symbol or identify a math symbol or character? — cgnieder, Feb 21 '15 at 13:21

score 2 · Answer 1 · edited Feb 21 '15 at 13:25

2

$\mathfrak{F}($ and $\mathfrak{G}$

edited Feb 21 '15 at 13:25

cgnieder

answered Feb 21 '15 at 13:21

Benjamin McKay

1 Answers1