Learn how to bold math symbols: Easy steps - LaTeX-Tutorial.com
latex - bold not bold enough in math - TeX - LaTeX Stack Exchange
Gro-Tsen on X: "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