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The command \nsum resizes the \sum symbol by the factor 1.4 (fits OP's fraction). It does take an optional argument to give another factor. It does take an optional argument to give another factor. I admit that the \raisebox factor calculation is a bit sketchy as it uses the text style \sum symbol for the calculation but for cmr it's a good fit ...
Best way to solve the question is create the character using Tikz: In that way when "typing" in the character \UNALsigma{0.4} or \UNALsigmarc, between the brackets the character can be scaled. Also \UNALsigmarc is a "rounded-corners" version of the character. The output is the following:
Getting Symbols on top of a Sigma. Trying to get this equation working within latex but having trouble getting it working I did try the following. \mathlarger {( I * K)_{xy} = \Sigma^{h}_{i=1} \Sigma^{w}_{j=1} K} Welcome! Replace \Sigma by \sum. The correct symbol is \sum (for “summation”), not \Sigma. Also there is no reason for \mathlarger.
1) Specify math font as \setmathfont {XITS Math} (I'm on a linux system and that is the name of the font my system reports) and 2) Adding \usepackage {bm} AFTER setting the math font. Without step 2), greek bold characters don't show up and latin bold appears to be typeset in Latin Modern Bold. – Orestes Mas.
Add a comment. 4. If you can use LuaLaTeX or XeLaTeX, the best way to get the upright ς is to load unicode-math. Here are a few of the different commands the package supports for it in math mode: \documentclass[varwidth]{standalone} \usepackage{unicode-math} \begin{document} \( \mupvarsigma \symup\varsigma \symup{^^^^03c2} \) \end{document}
71. You can force the subscripts to be under the summation, by using \limits, like this: \sum\limits_{j=1} A_{xj} An alternative way is to change the typesetting style of the formula by using \displaystyle. You probably already noticed, that the typesetting of math differs depending on what 'mode' your in: inline math or display math:
5. I'd prefer \mathscr{F} to \mathcal{F} here. Also, mathtools is nice because it takes care of a number of spacing issues and ensures that you always have matching brackets. This loads a new command \mathscr{F} instead of changing the entire font, as in Mico's answer. \documentclass{article} \usepackage{mathtools} % for paired delimiters.
Preferably this would work when calling \sigma straight away without showing the small sign alltogether. EDIT: I am looking to make the lower case greek sigma an upper case letter. I am not looking for a sum sign. I have tried \renewcommand{\sigma}{\scalebox{2}{$\sigma$}} but it didn't work. It says sigma already defined.
How to write two below symbol in picture for a sigma algebra in latex? Those are standard euler calligraphic and fraktur fonts. Loading the package euscript with the mathcal (mathscr) option will replace the \mathcal alphabet (define a new one \mathscr).
Unfortunately, it's not possible to mark two answers as correct. @Thomas: As I said, the difference between the two answers lies in the size of the summation signs, which is changed by \displaystyle in this case. @Michael: It is not the \limits that changed the size of the sigma symbols, it was the use of \displaystyle.