You can have the list of fonts in the resulting .pdf from the File -> Properties menu in most pdf viewers.
– BernardNov 13 '19 at 09:59
@Bernard Thank you. It shows CMR10 and CMSY10, does both of them work together?
– JJJohnNov 13 '19 at 10:30
cmr10 is the default font for text,cmsy10 is a symbols maths font, which probably (I didn't check) contains the math calligraphic glyphs.
– BernardNov 13 '19 at 10:37
@Bernard Thanks a lot! Please move your comments to answer, I'll accept it.
– JJJohnNov 13 '19 at 10:38
I don't think it's necessary, I'm sure there's already (at least) an answer on this subject. Thank you anyway!
– BernardNov 13 '19 at 10:39
@dgoodmaniii This is not specific to Overleaf. And the "accepted" in comment solution is a short version of the first answer in the proposed duplicate.
– Ralf StubnerNov 14 '19 at 10:29
The question seemed specific to Overleaf to me. If I'm wrong, then this is definitely a duplicate.
– dgoodmaniiiNov 14 '19 at 14:44
File -> Propertiesmenu in most pdf viewers. – Bernard Nov 13 '19 at 09:59