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I want to show identity element of a normed vector space with 1 that have extra line .How can I do it?

Touba Parsa
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  • In order for your question to not get closed as being unclear. Please explain in more detail what you are looking for. As the question is here is is hard to understand what you are talking about. – daleif Dec 06 '22 at 12:00
  • @Sigur - Which math font package provides usable output for \mathbb{1}? – Mico Dec 06 '22 at 12:30
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    @Mico, sorry. I mean ds as you wrote. It was out of habit. lol – Sigur Dec 06 '22 at 12:49
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    Normed vector space don't have a 1. Normed algebras may. – egreg Dec 06 '22 at 14:13

1 Answers1

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If by "1 that have extra line" you mean a double-struck 1, the following solution may be of interest to you.

enter image description here

\documentclass{article} % or some other suitable document class
\usepackage{dsfont}
\begin{document}
$\mathds{1}$
\end{document}
Mico
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