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I'd like to write a majuscule delta-like symbol in LaTeX but I can't find it's syntax anywhere. You can see the symbol on equation (12) of the following paper:

"Two-Frame Motion Estimation Based on Polynomial Expansion".

enter image description here

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migrated from stackoverflow.com May 23 '11 at 16:44

This question came from our site for professional and enthusiast programmers.

Note that the document uses Springer's LNCS style. In this style, all Greek letters are in italics, and vectors are denoted by boldface.

Most likely the bold italic Delta is produced in this particular case by something similar to this:

\documentclass{llncs}
\begin{document}
$\vec{\Delta}$
\end{document}

The result is:

llncs

Note that if you used the article class, the same code would produce a normal Delta with an arrow:

article

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If one really wants a bold italic Delta, the way to go is

\usepackage{bm}
\newcommand{\bfitDelta}{\bm{\mathit{\Delta}}}

Of course, one could write every time \bm{\mathit{\Delta}}.

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That is just $\Delta$ which is different from $\delta$. LateX symbols are case-sensitive. See any of the LaTeX cheat sheets as e.g. this one a U Colorado.

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Thanks for the cheat sheet, but it is not a regular delta. Is as if it was in italic. Please check the paper to see what I'm talking about. – Renan May 23 '11 at 2:37
    
Same symbol, different font. – Dirk Eddelbuettel May 23 '11 at 2:50
1  
@Renan: What if you typeset it in italics, e.g. \mathit{\Delta}? – Torbjørn T. May 23 '11 at 17:01
    
The cheat sheet link is dead. Redirects to the homepage. – HSchmale Sep 21 '15 at 17:41

This looks very much like \Updelta (\usepackage{ upgreek })

UpDelta vs standard Delta

As you can see here, when compared with the standard Delta, the Updelta has an italic look to it.

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Why \Updelta? It is pretty obvious that the Delta in the question is italic. – Henri Menke Jun 16 at 8:35
    
@HenriMenke I think that someone visiting this question may be interested in other alternatives, and as you can see from the above comparison the Updelta symbol certainly looks more like the italic delta than the standard delta symbol. – JStrahl Jun 21 at 11:56
    
Even though it might be useful, it does not answer the question and according to site policy an answer has to address the question. Also we do not want to clutter the answer section with might-be-useful posts. Neither does the symbol reproduce the one in the question, nor is it italic (see this picture). – Henri Menke Jun 21 at 13:29

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