[Tex/LaTex] Using underset and overset together

Question

I would like to use underset and overset together above and below the word. Current output looks like this:

\begin{equation}
    v_t(j)=max^{N}_{i=1}v_{t-1}(i)a_{ij}b_j(o_t)
\end{equation}

I would like both the superset and the underset to be placed exactly above and below the max.

Answer 1

Welcome to TeX.SE! As egreg pointed out in the comments, you can achieve what you want using \max_{i=1}^{N}, like so:

\documentclass[12pt]{article}
\usepackage{amsmath} % Only for the equation* environment

\begin{document}
  \begin{equation*}
    v_t(j) = \max_{i=1}^{N}v_{t-1}(i)a_{ij}b_j(o_t)
  \end{equation*}
\end{document}