This is pdfTeX, Version 3.14159265-2.6-1.40.21 (MiKTeX 2.9.7350 64-bit) (preloaded format=pdflatex 2020.4.1)  25 APR 2020 20:44
entering extended mode
**C:/Users/proto/Documents/3550/files/curl.tex
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! TeX capacity exceeded, sorry [grouping levels=255].
\mathpalette #1#2->\mathchoice 
                               {#1\displaystyle {#2}}{#1\textstyle {#2}}{#1\...
l.129 Thus $\iint_S curl \F \bigcdot
                                     d{\bf S} = \iint_R  <3x^3y^2, -3x^2y^3 ...
If you really absolutely need more capacity,
you can ask a wizard to enlarge me.

 
Here is how much of TeX's memory you used:
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 318i,255n,380p,230b,1089s stack positions out of 5000i,500n,10000p,200000b,50000s
!  ==> Fatal error occurred, no output PDF file produced!