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## Identity Matrix Symbol (double ones)

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### Identity Matrix Symbol (double ones)

Hi, how to type the identity matrix symbol (the double ones). I don't mean the
Code: Select all  •  Open in writeLaTeX
\mathbb{I}
symbol.

I can't also find it in the The Comprehensive LATEX Symbol List.

Last edited by haaj86 on Sat Aug 21st, 2010, edited 1 time in total.
haaj86

Posts: 21
Joined: Mon Apr 6th, 2009

### Re: Identity Matrix Symbol (double ones)

Hi,

which symbol do you want exactly? Can you please provide a link to the exact symbol you're trying to find?
1,1,2,3,5,8,13,21,34,55,89,144,233,...

gmedina

Posts: 2313
Joined: Wed Jul 11th, 2007
Location: Colombia

### Re: Identity Matrix Symbol (double ones)

To be honest I usually use the big "I" to represent the indentity and most books uses this one. But I remember seeing this one:
identity.png (850 Bytes) Viewed 29841 times

I drew this with paint because I can't find a webpage that uses it.

Thank you!

Edit by localghost: No external links (see Board Rules)! Attachments go onto the forum server (where applicable).
haaj86

Posts: 21
Joined: Mon Apr 6th, 2009

### Re: Identity Matrix Symbol (double ones)

Detexify says
Code: Select all  •  Open in writeLaTeX
\documentclass{article}\usepackage{bbold}\begin{document}$$\mathbb{1}$$\end{document}
Joseph Wright
josephwright
Site Moderator

Posts: 802
Joined: Tue Jul 1st, 2008

### Re: Identity Matrix Symbol (double ones)

Thanks Joseph! This is precisely what I'm looking for.
haaj86

Posts: 21
Joined: Mon Apr 6th, 2009