subscript for a join (\bowtie) operation in LyX/LaTeX

Question

I'm using LyX to write some Relational Algebra queries. I'm using the \bowtie symbol for the join operation but when I try to put a text in subscript directly under the symbol, I get the following error:

...a_{\t{pId}}\t{person}\right)\bowtie\limits {\t{pId}{1}=\t{pId}_{2}... I'm ignoring this misplaced \limits or \nolimits command.

Anyone knows how to do what I want? Preferably in LyX, but ERT code snippets will also be appreciated. Thanks!

Edit: \t is a macro for \text.

score 6 · Answer 1 · edited Dec 11 '12 at 17:49

6

Better use

\Join

It works fine for me

edited Dec 11 '12 at 17:49

Konrad Viltersten

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answered Dec 11 '12 at 17:28

Nitesh

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score 4 · Accepted Answer · answered May 25 '10 at 08:29

4

Your problem is that \bowtie is not math operator such as \int, \sum etc.

Try this in preamble:

\usepackage{amsmath}
\DeclareMathOperator*{\btie}{\bowtie}

and this in document:

\(\btie\limits_{subscript}^{superscript}\)

I hope it's what you're looking for.

answered May 25 '10 at 08:29

Crowley

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More informations are here: ftp://ftp.ams.org/pub/tex/doc/amsmath/short-math-guide.pdf – Crowley May 25 '10 at 08:37
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+1 - That's what I'd suggest too. There are many ways to make a new math operator, this is my preferred choice. – Geoff May 25 '10 at 12:43

James Wernicke · Answer 3 · 2012-03-18T22:52:23.423

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From http://en.wikibooks.org/wiki/LaTeX/Advanced_Mathematics#Above_and_below:

In preamble:

\usepackage{amsmath}

In equation:

\underset{your_subscript_here}{\bowtie}

edited Mar 18 '12 at 22:52

answered Feb 29 '12 at 22:10

James Wernicke

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subscript for a join (\bowtie) operation in LyX/LaTeX

3 Answers3