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This is my first time using Latex, is there a way to write an equation like this??

I can't find that symbol. Thank you very much!

Maria
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    Like this? `\documentclass{article} \usepackage{amssymb}

    \begin{document}

    $A\gtrless B$

    \end{document}`

     – Gonzalo Medina Jan 28 '15 at 18:08
  • Welcome to TeX.SX! Is Gonzalo's comment helpful? Otherwise, which symbol are you referring to that you can't find? This question might be helpful if you cannot find a particular symbol: http://tex.stackexchange.com/questions/14/how-to-look-up-a-symbol-or-identify-a-math-symbol-or-character – Adam Liter Jan 28 '15 at 18:17
  • Thank you, his answer was very helpful. I will use that link as well. Thanks! – Maria Jan 28 '15 at 18:23

1 Answers1

5

One option:

\documentclass{article}
\usepackage{amsmath}
\usepackage{amssymb}

\begin{document}

$\Lambda(x)\underset{FP}{\overset{TP}{\gtrless}} T^{\ast}$

\end{document}

enter image description here

Of course, define a command:

\documentclass{article}
\usepackage{amsmath}
\usepackage{amssymb}

\newcommand\gldec[2]{
\underset{#1}{\overset{#2}{\gtrless}}
}

\begin{document}

$\Lambda(x)\gldec{FP}{TP} T^{\ast}$

\end{document}

Or (should "FP" and "TP" be fixed):

\documentclass{article}
\usepackage{amsmath}
\usepackage{amssymb}

\newcommand\gldec{
\underset{FP}{\overset{TP}{\gtrless}}
}

\begin{document}

$\Lambda(x)\gldec T^{\ast}$

\end{document}

I'm not sure of the font that should be used for "FP" and "TP", but that is up to their meaning; is they should be treated like text, then \text{FP} and \text{TP} should be used.

Gonzalo Medina
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    Followup to @GonzaloMedina 's answer. If F and P represent variables, keep them as they are so they are italicized and spaced properly. If they are text, use \text{FP}. (A general principle for text in equations.) – Ethan Bolker Jan 28 '15 at 18:29
  • @EthanBolker I added a little remark to my answer. Thanks! – Gonzalo Medina Jan 28 '15 at 18:32