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I want to write this 1 in latex, could anyone help me, please?

enter image description here

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  • @Zarko Hi, the tags are all wrong. Can I edit the question of the user?
    – Sebastiano
    Aug 31 '19 at 15:59
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    @Sebastiano yes, please. this is my first time to ask here so I do not understand exactly which tag my question should go under
    – Secretly
    Aug 31 '19 at 16:05
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My welcome to TeX.SE. This is a standard question. The next time use this tool to search your symbol: http://detexify.kirelabs.org/classify.html

enter image description here

\documentclass{article}
\usepackage{dsfont}
\usepackage{amsmath,amssymb}
\begin{document}

$f \times \mathds{1}$
\end{document}

If you do not like the symbol 1 in the image, there is another option with LaTeX. Use bbold package as an example and image that I have included.

enter image description here

\documentclass{article}
\usepackage{bbold}
\usepackage{amsmath,amssymb}
\begin{document}

$f \times \mathbb{1}$
\end{document}
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  • why $\mathds{1}$ is not working when I am editing a question on math stack exchange?
    – Secretly
    Aug 31 '19 at 16:11
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    @hopefully For my humble opinion LaTeX is not MathJaX :O)
    – Sebastiano
    Aug 31 '19 at 16:14
  • So how can I type this symbol in MathJaX?
    – Secretly
    Aug 31 '19 at 16:15
  • @hopefully There is not. Sorry. Can you read this link, please? github.com/mathjax/MathJax/issues/792
    – Sebastiano
    Aug 31 '19 at 16:16
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    @hopefully Math stack exchange works with MathJax, but MathJaX is not LaTeX...therefore...there is no possibility to have this symbol. Look this link mathjax.org/#demo and on live demo write: $\mathds{1}$. The \mathsds is colored in red.
    – Sebastiano
    Aug 31 '19 at 16:20

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