LaTeX: How to find package(s) that a command belongs to?

Posted by Ashwin on Stack Overflow See other posts from Stack Overflow or by Ashwin
Published on 2010-03-13T23:55:52Z Indexed on 2010/03/14 0:05 UTC
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It is a simple question to which I am not able to find the answer:

Given a LaTeX command, how do I find out what package(s) it belongs to or comes from?

For example, given the \qquad horizontal spacing command, what package does it come from? Especially troublesome since it works without including any package!

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