If I have a line of text, how do I make just the first word bold?

I tried this:

\bf{NTn} = Number of lines

but it made the entire line bold.


You should not use \bf. Instead use {\bfseries ....}.


{\bfseries NTn} = Number of lines

$\mathbf{NTn} + \boldsymbol{\pi} + \pmb{\pi} $ = Number of lines.

\verb|\boldsymbol| and \verb|\pmb| are provided by \verb|amsmath| package. Note that \verb|\mathbf| has no effect on symbols like $+$ or $-$ or $\pi$ etc.


enter image description here

However, it is better to use \bm from bm package for such needs which gives correct results.

  • Thanks, but what if I need to bold the following: $NT_n$ ? {\bfseries $NT_n$} doesn't work.....
    – ngramsky
    May 16 '12 at 5:16
  • 1
    @ngramsky, for math mode, use `\mathbf{e^{j\pi}=-1}'. May 16 '12 at 5:22
  • For bolding math you can use \boldmath, \boldsymbol or \pmb. For mor details see here
    – adn
    May 16 '12 at 5:23
  • @ngramsky: see the edited answer.
    – user11232
    May 16 '12 at 5:29
  • 1
    @HarishKumar I stumbled upon this answer and find it very wrong. For instance \boldmath works just by chance and throws warnings; \boldsymbol is deprecated and \bm (from the bm package) should be used.
    – egreg
    Nov 2 '14 at 10:14

For regular, bold and italics math, use the bm package:

enter image description here

\usepackage{bm}% http://ctan.org/pkg/bm
$NTn=\bm{NTn}=\mbox{Number of lines}$

this works for me

  • This answer is very short and does not provide some new solution
    – user31729
    Nov 2 '14 at 9:34
  • 3
    Actually, \textbf was only mentioned in comments.
    – lockstep
    Nov 2 '14 at 10:51

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