Is there a symbol for order?
...the exponent, ei , is called the order of pi in a, denoted ordpi (a) = ei .
2 Answers
From your comment it became clear that you were looking for the order operator.
In case somebody finds this question but is looking for the order (of magnitude):
\documentclass{article}
\DeclareRobustCommand{\orderof}{\ensuremath{\mathcal{O}}}
\begin{document}
$\orderof\left( 1234\right) =10^{3}$
\end{document}
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1
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2@Jeff: I used "Capital Oh", for which
\mathcal{O}exists. But when you want to use "small oh", there are already several possible solutions at \mathcal(O) and font size.– StephenJun 25, 2014 at 9:08
I assume you're not looking for a certain symbol, but rather the operator ord, as found on the top of page 7 of the Mark Siggers' Cryptography Class notes. You can define your own operators using amsmath's \DeclareMathOperator:
\documentclass{article}
\usepackage{amsmath}
\DeclareMathOperator{\ord}{ord}
\begin{document}
\ldots the exponent, $e_i$, is called the order of $p_i$ in $a$, denoted $\ord_{p_i}(a)=e_i$.
\end{document}
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Yes, (other than the fact that Siggers' notes seem to be only 6 pdf pages long ;) ) that is the symbol (well operator). Based on your answer, I'm assuming there is no order operator in Latex. But other than what is the difference between using \Declaremathoperator and plain old \newcommand{\ord}{\mathrm{ord}} (not counting that \Declaremathoperator is a little easier)– JeffSep 25, 2011 at 6:19
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Also, how did you get Latex to work in this forum? I searched and couldn't figure out how?– JeffSep 25, 2011 at 6:22
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3Using
\DeclareMathOperatormakes sure that the spacing around the operator is correct (try typesetting$x \ord y$with the two different approaches). LaTeX doesn't work directly on this site (it's a screenshot). It does on sister sites like math.stackexchange.com, but we mainly need to show LaTeX code, so rendering it would not be very helpful.– JakeSep 25, 2011 at 6:42 -
Oh, by the way, the PDF I linked to has 6 pages, but there are two logical pages per PDF page.– JakeSep 25, 2011 at 7:18
`to mark your inline code in comments as well as in answers. I'm wondering if we should make this question a bit more specific and widely-applicable by changing the title to "Is there a math operator for 'order' or how can I define it?" -- whaddya think?$\mathcal{O}$symbol, which is generally used to write as "order of ...".\mathcal{O}symbol, as he explained in the comment to my answer. Also, Stephen already included\mathcal{O}in his answer.