How to compute the integral $(1+t^2) / (1-t^2) $ on math.SE. Found using Approach0. — Martin Sleziak 4 hours ago
5:49 AM
@MartinSleziak is that approach0 site any good for finding papers, by the way? Every once in a while I try to find a paper with notation that won't show up in google, and that seems like maybe it's nice! — Harry Gindi 3 hours ago
6 hours later…
12:07 PM
Approach0 only search among Mathematics.SE posts, since this is the only site which is indexed there.
There was also short discussion on MathOverflow meta whether MO should be indexed too, but it seems that there was not much interest: Is there any third party search engine for MathOverflow?
I recall that here on meta somebody mentioned that Zentralblatt has some kind of search: Searching mathematical formulae like in Zentralblatt Math
For example: What is the best way to search for a math equation on the internet? and How to search the internet for strings that consist mostly of math notation?
People mentioned there a few search engines: symbolhound, searchOnMath, uniquation, LaTeXSearch (Springer).
There's (uni)quation, and there's $\LaTeX$ Search. — J. M. is not a mathematician Oct 21 '11 at 16:40
However, I do not have much experience with any of them. I think I've tried uniquation a bit. I think most of them do not search papers. (More like websites, maybe specifically Wikipedia, MO, Math.SE and similar sites.)
in In the search of a question, Jan 7 at 17:48, by Martin Sleziak
Uniquation seems to return also some results from Math.SE and MathOverflow, which is why I have mentioned it in an answer to the meta.MO post.
12:51 PM
Personally I think that Approach0 is very good when searching for formulas. But, as I said, it only searches on math.SE.
For example, if I search for $\lim_{n\to\infty}\left(1+\frac1n\right)^n$, the results on the first page looks quite relevant to this.
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