# How can we write this big one in latex? [duplicate]

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

• @Zarko Hi, the tags are all wrong. Can I edit the question of the user? Aug 31 '19 at 15:59
• @Sebastiano yes, please. this is my first time to ask here so I do not understand exactly which tag my question should go under Aug 31 '19 at 16:05

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

\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.

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

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

• why $\mathds{1}$ is not working when I am editing a question on math stack exchange? Aug 31 '19 at 16:11
• @hopefully For my humble opinion LaTeX is not MathJaX :O) Aug 31 '19 at 16:14
• So how can I type this symbol in MathJaX? Aug 31 '19 at 16:15
• @hopefully There is not. Sorry. Can you read this link, please? github.com/mathjax/MathJax/issues/792 Aug 31 '19 at 16:16
• @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. Aug 31 '19 at 16:20