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I saw this letter i in some papers and wanted to use it in one of my documents; couldn't find how to get it to appear.enter image description here

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  • $i_\mathbb{R}$ with \usepackage{amsmath, amssymb}?
    – CarLaTeX
    Nov 21, 2021 at 19:40
  • Related/duplicate: What are all the font styles I can use in math mode?
    – Werner ♦
    Nov 21, 2021 at 19:43
  • No, already tried that one, @CarLaTeX. Didn't find the fontstyle there either, Werner.
    – Pedro García
    Nov 21, 2021 at 19:58
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    Please edit your question and add a minimal example. As your question is, it's impossible to help you.
    – CarLaTeX
    Nov 21, 2021 at 20:00
  • @PedroGarcía: Is that because there's no \mathbb{R} listed in the answer? That answer just shows the first couple of letters of the alphabet, but surely you should have noted that, right?
    – Werner ♦
    Nov 21, 2021 at 20:39

1 Answer 1

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This seems to be Iwona Condensed:

enter image description here

or just Iwona:

enter image description here

\documentclass{article}

\usepackage[condensed,math]{iwona} % remove condensed for standard width
\usepackage[T1]{fontenc}
\usepackage{amsfonts}

\begin{document}

La aplicaci\'on $i_{\mathbb{R}}$

\end{document}

In general, one can consult the LaTeX font catalogue for to search for a particular font.

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