Math & ScienceExpression like binomial Coefficient with Angle Delimiters

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Richard_B
Posts: 4
Joined: Mon May 28, 2012 4:37 am

Expression like binomial Coefficient with Angle Delimiters

Post by Richard_B »

I want to typest a binomial coefficient but using angle brackets instead of round parentheses. This notation is used in the book "Counting: The Art of Enumerative Combinatorics" by George E. Martin to denote "n choose r with repetition."

I tried

Code: Select all

$\left\langle\begin{array}{c} n \\ r \end{array}\right\rangle$
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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but that was too big and didn't look right. I also tried

Code: Select all

$\langle \stackrel{n}{r} \rangle$
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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but that didn't look right either.

If anyone has a solution to this, please let me know.
Last edited by localghost on Tue May 29, 2012 6:26 pm, edited 2 times in total.

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Stefan Kottwitz
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Posts: 10345
Joined: Mon Mar 10, 2008 9:44 pm

Expression like binomial Coefficient with Angle Delimiters

Post by Stefan Kottwitz »

Hi Richard,

welcome to the board!

You could use \genfrac of amsmath and define your own macro.

Code: Select all

Code, edit and compile here:
\documentclass[a4paper]{article}
\usepackage{amsmath}
\DeclareRobustCommand{\abinom}{\genfrac{\langle}{\rangle}{0pt}{}}
\begin{document}
\[
\abinom{n}{r}
\]
\end{document}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Stefan
LaTeX.org admin
Richard_B
Posts: 4
Joined: Mon May 28, 2012 4:37 am

Re: Expression like binomial Coefficient with Angle Delimite

Post by Richard_B »

Hi Stefan,

Thank you. That works perfectly and is exactly what I needed.
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