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I want to make a $ \rightrightarrows $ (basically two rigtharrows vertically aligned) in a latex file, I have tried to use some libraries, but I don't have a clue which one is the right one (I'm also failing totally about finding it about). I have tried to include ansmath, ansmath + tikz + arrows.

Additional question, how should one go about when encountering "! Undefined control sequence." and googling the name of the sequence doesn't give results?

user1335014
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    You can look up symbols in the Comprehensive Symbol List, or alternatively, try Detexify. Note that it's amsmath, not ansmath. Your second question is a bit vague; can you be more specific about the help you need? – Ian Thompson Nov 19 '13 at 14:22
  • The specific case that I had in the second question was that I knew the name of the sequence (rightrightarrow), but I didn't knew which package to include. I asked the question, because when I encounter a similar case in the future I didn't have any lookup method. Symbols section from Detexify also give package name, so that is covered now. Thank you. – user1335014 Nov 20 '13 at 15:24

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the command/symbol \rightrightarrows exists in amsfonts.

\usepackage{amssymb} to gain access to it.

texdoc amsfonts for the amsfonts user's guide.

barbara beeton
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