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There is lots of symbols and may be operators like || in this expression

$ 3^k||n$

that I would like to be able to quickly find the meaning of. I tried Wolfram|Alpha but I think it expects the name of the symbol instead of the symbol itself, so it doesn't give me the correct answer.

Some resources you could recommend?

Thanks!

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    @stevenvh Yes, that's the document I was reading. I wanted to know the answer to that apparently easy problem, and got stuck in that expression. This monday I start my first year of the degree in computer science, and I wanted to improve my maths. The most interesting things I could find are all wrote in math notation. If I knew lots of this notation and maths I would create a webapp to add math symbols and descriptions and offer symbol lookup, so every one interested could decypher this kind of expressions2012-09-29

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Of course, Wikipedia does have at least some notation list.

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I've found that in mathworld there is a section where there are a lot of info about this notation. A shame I can't use the WolframAlpha search tool to put the unicode symbol and find it.

http://mathworld.wolfram.com/topics/Notation.html