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I'm using multidimensional formulas in my work and to differ it from the onedimensional ones I denote it by \mathbf, but what am I supposed to use in the definition and theorems environment to look samely almost like italic?

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It's usually a bad idea to make the font used for mathematical symbols depend on the text font used for the surrounding environment. Thus if you are using upright bold for the symbol then best to do so even if your theorem text is italic. Or you may prefer to use bold math italic instead of \mathbf eg using \bf{A} from the bf package, but use the same version consistently. –  David Carlisle Jun 19 '12 at 11:43
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For mathematical expressions, particles, and formulas, I would not switch between upright and italics, or between bold-upright and bold-italics, in response to the shape (upright or italics/slanted) of the surrounding text. –  Mico Jun 19 '12 at 11:45
    
@DavidCarlisle Isn't it "\bm{A} from the bm package"? –  egreg Jun 19 '12 at 12:13
    
@egreg er yes, missed by 4 keys, that's bad even for me:-( I can't edit the comment so I'll make it an answer and fix there. –  David Carlisle Jun 19 '12 at 12:25

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up vote 3 down vote accepted

It's usually a bad idea to make the font used for mathematical symbols depend on the text font used for the surrounding environment. Thus if you are using upright bold for the symbol then best to do so even if your theorem text is italic.

Or you may prefer to use bold math italic instead of \mathbf eg using \bm{A} from the bm package, but use the same version consistently, that is don't switch between \bm and \mathbf depending on the surrounding text font.

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