also, can anyone suggest me good pdf file for it to learn the coding maths in latex
Thank you
For inline math, use $ delimiters:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
$a_{\max} = \max\limits_{0\le a\le\mathrm{argmin}(a(t))} a(t)$
\end{document}
For display math, use \[...\] delimiters for unnumbered equations, or one of the various environments, such as equation for numbered equations. Or, with the amsmath package, something from the align family of environments.
\documentclass{article}
\usepackage{amsmath}
\begin{document}
OP comments:
could you please help to write codes for these four equations?
thank you very much in advance.
\begin{align}
T_d=T_\mathrm{upper}-T_\mathrm{Lower}\\
%
T_\mathrm{upper} = \min\{t||a(t)|\ge a_\mathrm{threshold}\}\\
%
T_\mathrm{lower} = \max\{t||a(t)|\ge a_\mathrm{threshold} \}\\
%
a_\mathrm{threshold} = 10\% \max(|a(t)|)
\end{align}
\end{document}
$ ... $math mode? – Sigur Nov 07 '19 at 12:28