# Typing the semidirect product symbol [closed]

I am using writelatex to write a paper and I need to type the semidirect product symbol...but for some reason, it keeps saying "error" and I can't see the semidirect product in the paper. I tried both `\rtimes` and `\ltimes` and both did not work. I searched the internet to see if there were other ways to type it using latex but I only found these two, and they both didn't work in writelatex...so I was wondering if anybody could help me with this...

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## closed as too localized by Tom Bombadil, Thorsten, Matthew Leingang, barbara beeton, yo'Apr 26 '13 at 11:46

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Are you using the amssymb package? –  kan Apr 26 '13 at 10:27
And here goes a MWE: writelatex.com/158819zfcjtc –  kan Apr 26 '13 at 10:29
No, I'd think you'll have to load `amsmath` together with `amssymb`: `\usepackage{amsmath, amssymb}`. –  kan Apr 26 '13 at 10:34
The ams packages are distributed in several different families. Take a look at ftp.ams.org/pub/tex/doc/amsmath/amsldoc.pdf and ftp.ams.org/pub/tex/doc/amsfonts/amsfndoc.pdf to see what the `amsmath` and `amssymb` packages contain. –  Willie Wong Apr 26 '13 at 10:43
@Artus `amsmath` provides many facilities for typesetting, such as alignment environments; `amssymb` provides scores of symbols; they are complementary, not alternative. –  egreg Apr 26 '13 at 11:03

It also tells you that you need the `amssymb` package.