Tag Archives: upgoer five

Stable cohomology for Hurwitz spaces: Upgoer Five version

People ask how many of a kind of thing there are; the thing might be a kind of number, or something like a number. I, together with others, work out how many of those things there are by understanding the way some kinds of spaces look; these spaces are, in a way, the same as the things about which we ask, “how many,” but in another way they are different.  This allows us to use different ideas when we think about them, and answer some questions about numbers which could not be answered before.

Make your own!

(inspired by xkcd, natch.)

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