Jose Luis Arellano <>
10. September 2016 um 09:56

For Math.
The \tf and \bf commands in math aren’t font switches like in text.

Most math fonts come only with a regular style which provides upright, italic, bold and bolditalic symbols but all of them part of the same font, only a few fonts provide also a bold style (which is usefull in sections) which comes also with upright – and sometimes bold – symbols.



    {\tf xyz} \; xyz \; {\bf xyz} \; {\bi xyz} \quad
\mb {\tf xyz} \; xyz \; {\bf xyz} \; {\bi xyz}


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