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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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There's (uni)quation, and there's $\LaTeX$ Search. – J. M. Oct 21 '11 at 16:40
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 – Zev Chonoles Oct 21 '11 at 16:43
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.) – Martin Sleziak Aug 25 '12 at 13:20
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. – Martin Sleziak Apr 8 '14 at 11:58

I recommend using 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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You can search for mathematical formulas and symbols using searchOnMath.

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