Latex Undefined control sequence. ...m

Posted 2022-03-19 lisamon

遇到Undefined control sequence问题

原来是\bm\theta无法识别

解决方法:

To use \boldsymbol (in math mode, of course), you need to load the amsmath package.

Alternatively, load the bm ("bold math") package and write \bm\beta (again in math mode, of course).

e,g,

\documentclassarticle
\usepackageamsmath % for \boldsymbol macro
\usepackagebm      % for \bm macro
\begindocument
$\boldsymbol\beta = (\beta_1,\beta_2,\dots,\beta_n)$

$\bm\beta = (\beta_1,\beta_2,\dots,\beta_n)$
\enddocument