Here's a more constructive version of my previous comment. ArXiv has some useful (but non-obvious) functionality: namely, you can see everything that's been posted on arXiv in a given area in a given month by entering something like arxiv.org/list/math.XX/YYMM e.g. arxiv.org/list/math.SG/2211 — Jonny Evans Dec 2 at 10:56