I'm sure this is an easy question, but I'm not sure what the proper terminology is to search for the answer.


LaTeX gets all confused by this. How can I make k_{1,1} bold?

  • Welcome to TeX.SE! Do you mean to make the subscript 1,1 bold as well, or "only" the letter k? – Mico Apr 28 '13 at 17:56

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Note you should not use $$ in LaTeX.

the answer depends on what you mean by bold. If you use \boldmath or \bm the k uses bold math italic. If you use \mathbf then it uses bold upright roman.







Use \mathbf instead of \textbf.


You should change \textbf onto \mathbf.

BTW: LaTeX users will probably suggest you changing $$...$$ onto \[...\].

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