This maybe a silly question, but how do I type this first symbol? I can't seem to find it in any lists. Is it a small delta?
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As pointed out by Schrödingers cat, the direct answer is indeed \partial
To add to that answer, I have found it to be very handy to have a list of latex symbols for quick lookup.
Such as: https://oeis.org/wiki/List_of_LaTeX_mathematical_symbols
And for completness: http://tug.ctan.org/info/symbols/comprehensive/symbols-a4.pdf

\partial. – Mar 27 '20 at 06:23\documentclass{article} \begin{document} $\partial J(W)$ \end{document}– Mar 27 '20 at 06:30\partialanswer can be helpful, it seems. ;-) – Mar 27 '20 at 06:35