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
mtpro2 - PCTeXWeb
LATEX Mathematical Symbols
math mode - Bold vector symbols in heading - TeX - LaTeX Stack Exchange
math mode - Interaction of \boldmath and \not - TeX - LaTeX Stack Exchange