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added an example for the distinction concerning \left..\right
Martin Sleziak
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Approach0

Searching for a specific formula is often rather difficult. A tool which is very suitable for this is the Approach0 search engine.

Some basic information can be found in Guide for New Users (which contains also animations of some examples). If you want to know more about the project, you can look at the documentation.

Approach0 uses mathquill editor and also offers a handy-pad for entering mathematical expressions. But for people familiar with $\rm\LaTeX$/MathJax it might be much easier to enter the expression directly in this form using raw query. (And you can also copy-paste a formula into this field from the source of some post on the site.) You can find some useful information also in the post by the creator of this program: Announcing a third-party search engine for Math StackExchange.

For example, this is what you get if you search for $\sum_{k=1}^n \frac1{k(k+1)}$. You can find many other examples of usage of this search engine if you look at comments and chat messages mentioning Approach0.

Although the "searching" chatroom has a more general purpose, quite a lot of the conversation in that room was devoted to Approach0.


Some stuff which is useful to keep in mind when using this search engine:

Martin Sleziak
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