amsmathboldmathmath-mode
I want to get a subscript in math mode to be both regular text font and boldfaced. Neither of the following does the job:
Codes 1:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
$a_\text{\textbf{b}}$
\end{document}
Codes 2:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
$a_\mathbf{\text{b}}$
\end{document}
You can use \DeclareMathOperator from amsmath; this will also give you the right spacing:
\documentclass{article}
\usepackage{cmbright}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{pxfonts}
\DeclareMathOperator{\logit}{logit}
\begin{document}
\begin{gather}
\text{logit} \Bigg \{ P(Y = 1| X = x) \Bigg \} = \beta_0 + s(x)\\
\logit \Bigg \{ P(Y = 1| X = x) \Bigg \} = \beta_0 + s(x)
\end{gather}
\end{document}
You can simply remove the option math when loading mathspec.
MWE
\documentclass[11pt]{article}
\usepackage{mathspec}
\setprimaryfont{Linux Libertine O}
\begin{document}
1 $1$ $\mathrm{1}$ $\text{1}$
\end{document}
Output
Loading mathspec with the math option forces mathspec to load fontspec without the no-math option.
And the fontspec manual states:
If you find that
fontspecis incorrectly changing the maths font when it should be leaving well enough alone, apply the[no-math]package option to manually suppress its maths font.
Best Answer
a_{\textbf{b}}is what you want. The following example loads a different text font, for comparison with the maths, and compares this output with that froma\textsubscript{\textbf{b}}in text mode, to show that the subscripts (but not, of course the 'a's) are the same. Finally, this is compared with some maths subscripts, just for comparison.The left shows the result with the suggested code. The next is the text-mode comparison (same 'b', different 'a'). Third is a simple maths subscript (same 'a', different 'b'). Finally, a maths-bold subscript (same 'a', different different 'b').