# Put formulas on the left position in LateX [duplicate]

Possible Duplicate:
Left align (to the page) displayed math

As you know the following equation will be in the center:

$$\sum_{\substack{a\leq1/2\\0<b\leq T}}\frac{2+a}{2|b|}$$

And the following is on the left but in small size and decrease the space:

$\sum_{\substack{a\leq1/2\\0<b\leq T}}\frac{2+a}{2|b|}$

But the below formula is similar to the first one, but on the left:

$\displaystyle{\sum_{\substack{a\leq1/2\\0<b\leq T}}\frac{2+a}{2|b|}}$

Does anyone know another way such that it works similar to the last one (put the formula on the left) but with:

\begin{xxxx}
*
\end{xxxx}
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Possible duplicate of Left align (to the page) displayed math. –  Werner Jul 31 '12 at 19:53
Also see Why is $…$ preferable to ? –  Werner Jul 31 '12 at 19:54

## migrated from stackoverflow.comJul 31 '12 at 19:50

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## marked as duplicate by Werner, egreg, lockstep, Thorsten, Peter GrillAug 1 '12 at 6:45

You can use the flalign* environment from amsmath to put equations flush with the left hand side:

\documentclass{article}
\usepackage{showframe}% http://ctan.org/pkg/showframe
\usepackage{amsmath}% http://ctan.org/pkg/amsmath
\begin{document}
\begin{flalign*}
\sum_{\substack{a\leq1/2\\0<b\leq T}}\frac{2+a}{2|b|} &&
\end{flalign*}
\end{document}​

The extra alignment characters && is required. The showframe is merely to highlight the text block boundary and not needed in your final document.

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$\sum_{a\leq1/2}\frac{2+a}{2|b|}$