I have a table of formulas, some have a description next to them, I want the equations to appear left flush and the text between parentheses right flush. I was writing it in the following way.

\documentclass[letterpaper,10 pt,twocolumn,fleqn]{article}
\[{\bf P} = \int_{t_i}^{t_f}{\bf F}\,dt = \Delta{\bf p}\mbox{\hspace{7mm} (Impulse) }\]
\[\frac{dA}{dt} = \frac{l}{2\mu}=cte \mbox{\hspace{7mm} (Kepler's Second Law) }\]

but the alignment is different for each equation.

  • 1
    Please make your code compilable, starting with \documentclass{...} and ending with \end{document}. That may seem tedious to you, but think of the extra work it represents for TeX.SX users willing to help you. Help them help you: remove that one hurdle between you and a solution to your problem. – jub0bs Sep 2 '13 at 18:45
  • You need to include your preamble. As it stands, your code does not produce flush left equations. I need to know how you are doing this in order to work out what the problem with \tag* is. – Ian Thompson Sep 2 '13 at 19:04

You can use \tag* from the amsmath package.

\mathbf{P} = \int_{t_i}^{t_f}\mathbf{F}\,dt = \Delta \mathbf{p}\tag*{(Impulse) }
\frac{dA}{dt} = \frac{l}{2\mu}=cte \tag*{(Kepler's Second Law) }

Note that \mathbf is preferable to \bf; see this question for more details.

  • I tried this way but now the equations are not left flush. – Monica G Sep 2 '13 at 18:51
  • 2
    @MonicaG --- you didn't say anything about flush left equations! Perhaps you could edit your question to explain exactly what you want. – Ian Thompson Sep 2 '13 at 18:53
  • The complete document is \documentclass[letterpaper,10 pt,two column,fleqn]{article} \setlength{\columnsep}{2.5cm} \usepackage[inner=2.5cm,outer=2.5cm,bottom=2.5cm,top=2.5cm,landscape]{geometry} \usepackage{nopageno,array,graphicx,amsbsy,amsfonts} \usepackage{amsmath} \begin{document} [\frac{dA}{dt} = \frac{l}{2\mu}=cte \tag*{(Kepler's Second Law)}] .... \end{document} Now it display the equations left flush and tags right flush. – Monica G Sep 2 '13 at 19:30

Here's another approach, currently set up to use the full \textwidth.

\lreqn{\textbf{P} = \int_{t_i}^{t_f}\textbf{F}\,dt = \Delta\textbf{p}}{Impulse}
\lreqn{\frac{dA}{dt} = \frac{l}{2\mu}=cte }{Kepler's Second Law}

This is the paragraph that follow the list

enter image description here


You could put it in a tabular environment

\( \textbf{P} = \ds\int_{t_i}^{t_f}\textbf{F}\,dt = \Delta\textbf{p}\) & (Impulse) \\
\( \ds\frac{dA}{dt} = \ds\frac{l}{2\mu}=cte \) & (Kepler's Second Law) \\

enter image description here


You can use the align environment.

Here is an example.

Edit: I have compiled this into a minimal working example, as per request. This will compile using XeLaTeX. I compiled this on a Mac running the latest MacTex distribution, but I think this should compile on most systems with XeLaTeX.

Edit^2: A bunch of includes are redundant, for instance, the enumerate include. I have copied the preamble from LaTeX-it.

\usepackage[usenames]{color} %used for font color
\usepackage{amssymb} %maths
\usepackage{amsmath} %maths
\usepackage[utf8]{inputenc} %useful to type directly diacritic characters

\mathbf{P} = \int_{t_i}^{t_f}\mathbf{F}\,dt = \Delta \mathbf{p}\tag*{(Impulse) }


The align environment also gives you more fine grained control over the display of equations.

sample equation using align

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