This image is an example of what I want to get.

https://www.dropbox.com/s/dmqd0nt0thg5u ... o.png?dl=0
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\documentclass{article} \usepackage{xcolor} \newcommand{\inlinemath}[1]{\fcolorbox{red}{white}{\ensuremath{#1}}} \begin{document} In what follows we use the following notation: if \inlinemath{S}, \inlinemath{T \subseteq N}, \inlinemath{z=(z_i)_{i \in N}} is an $n$-vector, and\dots \end{document}
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