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I used for my thesis the \blacktriangle and \blacktriangledown commands and they work. I used the book document class.

Instead now I need to replicate them on a presentation, using the beamer document class. However in such a case the symbols do not appear and no related error seems to occur within the log.

EDIT: the symbol goes in conflict with the package unicode-math. However, when removing this package my colored bullets in math mode stop working: $\textcolor{green}{\textbullet}$.

EDIT 2: solved by using \bullet instead of \textbullet.

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