There is the well-known and useful Online Encyclopaedia of Integer Sequences. I’ve never actually used it, but the ATLAS of Finite Groups is presumably also useful. What would be nice is for there to exist also an accessable online reference for cohomology rings, or in general other algebraic invariants of topological spaces (cohomology was merely the one I was thinking of at the time of deciding to write this).

One day I’ll actually clean up the layout of this site, but that will be more likely if I actually get encouraged by knowing that people visit. In the meantime, I’ve added a mathematics page to my regular (though it should really be to my maths) homepage. In particular, there is a file with questions that I don’t know the answers to, and would like to know the answers to.

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