[Tex/LaTex] Making the subscript under the summation

math-modesubscripts

I'm writing some formulas inside a tabular. My formulas have summation but the subscript is showing next to the summation not under it! How can I make it under it?

Example (j is next to summation!):

enter image description here

Best Answer

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:

\documentclass[10pt,a4paper]{article}
\usepackage{amsmath}
\begin{document}
This sum $\sum_{i=1}^{\infty} \frac{1}{i}  $ looks different than
\[
    \sum_{i=1}^{\infty} \frac{1}{i}
\]
\end{document}

Output:

enter image description here

Related Solutions

[Tex/LaTex] making a big summation sign

You can use the command \mathlarger of the relsize package. It increases the size and it can be nested. For example:

\documentclass{article}
\usepackage{amsmath}
\usepackage{relsize}
\begin{document}
\begin{equation}‎
‎‎\cos x‎ ‎=‎ \mathlarger{\mathlarger{‎‎\sum}}_{n=0}^{\infty}\frac{(ix)^2n}{(2n)!}‎‎
\end{equation}‎
\end{document}

equation with bigger sum symbol

.....

[Tex/LaTex] How to extend the text under summation symbol without making extra space

Apart from \mathclap{…}, mathtools provides a command specifically set for these situations: \smashoperator{…}. Which is, more or less, like putting \mathclap{…} in both (sub and super scripts). Taking @tohecz advice about a'|a', your code will be like

\documentclass{article}
\usepackage{mathtools}

\begin{document}
\[
   a(i,k) \gets \min\Bigl\{ 0, r(k,k) + \smashoperator{\sum_{i'\notin\{i,k\}}} \max\{0, r(i',k)\} \Bigr\}
\]
\end{document}

Which will be like all the other answers. Moreover, that command has an optional argument: lr, default one, will smash both sides; r only smash the right; and l will smash the left. In the examples I will add some text over the operator so you can see how it works (it smashes both).

enter image description here

Best Answer

Related Solutions

[Tex/LaTex] making a big summation sign

[Tex/LaTex] How to extend the text under summation symbol without making extra space

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