Today on the arXiv, a survey of perfectoïd spaces was posted by their inventor Peter Scholze.

It is all way above my head, but two things are striking from an outsider’s perspective:

– after some comments, the main text starts by “*This introduction is essentially identical to a post of the author on MathOverflow*” (namely this).

– it lists a forthcoming paper as: P. Scholze. p-adic Hodge theory for rigid-analytic varieties. 2012. arXiv:1205.3463,* to appear in Forum*

*of Mathematics, Pi.* (Possibly the first reference ever to this journal.)

I may be wrong, but perhaps even just 5 years ago this would have refered instead respectively to something like “*Letter to X*” and “*to appear in Ann. Math.*“

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