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I want to represent the following sum in LaTeX.

enter image description here

I have tried it in the following way:

$$\sum_{{1 \le k \le n}_{ k odd}} k^2$$

But I have not got the desired result. Please help me.

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1 Answer 1

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You need to load the amsmath package and employ its \substack directive.

enter image description here

\documentclass{article}
\usepackage{amsmath}
\usepackage{newpxtext}             % Palatino text font
\usepackage[euler-digits]{eulervm} % Euler math font

\begin{document}
\[
\sum_{\substack{1 \le k < 100 \\ \textup{$k$ odd}}} k^2
\]
\end{document}
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  • @barbarabeeton - Thanks for this. I changed \text to \textup. (We don't know if the default text font is sans-serif -- in which case "odd" would look, well, odd, if it were typed in the roman font face...)
    – Mico
    Commented Apr 4, 2018 at 15:28
  • What is \usepackage[euler-digits]?
    – Sebastiano
    Commented Apr 4, 2018 at 21:23
  • @Sebastiano - euler-digits is an option passed to the package eulervm. I included the font-related directives in order to replicate the "look" of the OP's screenshot.
    – Mico
    Commented Apr 4, 2018 at 21:43

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