I already know how to make $\mathbf {bold}$ letters, and I know how to make various greek letters such as $\gamma$ and $\Psi$. But how to make any bold greek characters?
2 Answers
Like this $\boldsymbol{\alpha}$ $\boldsymbol{\alpha}$
For comparison a regular one $\alpha$
\mathbf{αβγ}
or {\bf αβγ}
also gives $\mathbf{αβγ}$ compared to $αβγ$ of the normal series.
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11$\begingroup$ But note ...
\mathbf{\alpha\beta\gamma}
does not work. $\endgroup$– GEdgarMar 16, 2019 at 11:39