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Is there a trick to search the internet for math notation? For example what if I want to search the internet for "X / ~" ? The default google search is useless for this and for similar searches where most of the search characters are not letters or numbers. Google code search allows this kind of search within source code, but this service will shut down in a few months and anyway it searches only source code not math.

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    $\begingroup$ There's (uni)quation, and there's $\LaTeX$ Search. $\endgroup$ – J. M. is a poor mathematician Oct 21 '11 at 16:40
  • $\begingroup$ By the way, since this probably came up in relation to my answer here, I was using the notation in the context of an equivalence relation and, in particular, it refers to the set of equivalence classes, a.k.a. the quotient set $\endgroup$ – Zev Chonoles Oct 21 '11 at 16:43
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    $\begingroup$ I've retagged the question, since I believe that the tag searching was intended for questions about various search algorithms. If my impression is wrong, feel free to retag the question again. (If this is the case, it might be nice to correct the tag-wiki, too.) $\endgroup$ – Martin Sleziak Aug 25 '12 at 13:20
  • $\begingroup$ I found this and this (But I am unable to search for the query in the latter, although according to description here is should be a search interface. $\endgroup$ – Martin Sleziak Apr 8 '14 at 11:58
  • $\begingroup$ Above Latex search is useless, too. $\endgroup$ – Takahiro Waki Jan 7 '17 at 5:47
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I recommend using symbolhound.com. I recently found this site, it will do a search for specific symbols, and is good for programming. May be good for math, just searched '4x^2' and it worked fine.

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See my side-project, it is developing its indices currently.

http://approach0.xyz

I will publish its first release when the entire math StackExchange is indexed.

Also, I am hoping someone interested can join and form a community to push this project forward, this is the reason I am posting here, even if this project is not fully ready for public using.

EDIT:

If you are interested in this project or have any amazing idea to help it improve, please follow this twitter account: https://twitter.com/approach0 , mention #approach0 to send feedbacks/questions. Approach0 will post updates on twitter too.

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You can search for mathematical formulas and symbols using searchOnMath.

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A few years ago we developed the search engine SearchOnMath, in order to search for mathematical formulas. Recently our tool has indexed both: Mathematics and MathOverflow.

Currently, SearchOnMath is the mathematical search engine with the largest number of indexed sites (including Wikipedia, Wolfram MathWorld, among others ...).

The following video illustrates how it works: SearchOnMath - a brief guide.

EDIT:

We’d love to hear your feedback. We also posted on Meta.

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