Learn how to bold math symbols: Easy steps - LaTeX-Tutorial.com
Gro-Tsen on Twitter: "Classic LaTeX: the answer to a question which aught to be trivial (getting bold math!) reveals (https://t.co/1ZLpXve2VU) the existence of about 42 packages to do it, with obscure interactions
Learn how to bold math symbols: Easy steps - LaTeX-Tutorial.com