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Mar 2 at 17:19 comment added Tom Copeland Dan, perhaps you can answer this question; mathoverflow.net/questions/466159/…
Apr 14, 2016 at 20:54 comment added Tom Copeland Alm and Petersen, "Brown's dihedral moduli space and freedom of the gravity operad" arxiv.org/abs/1509.09274
Sep 21, 2014 at 12:48 vote accept Tom Copeland
Sep 20, 2014 at 5:58 comment added Tom Copeland Brown and Bergstrom are inverting o.g.f.s, so the associahedra face vectors occur oeis.org/A133437, and McMullen is inverting e.g.f.s oeis.org/A134685.
Sep 20, 2014 at 3:19 comment added Tom Copeland Thanks Dan for the great overview. Hadn't seen McMullen's paper. (Murri gives nice diagrams of ribbons and marked Riemann surfaces. For the interested, see the OEIS refs.). The relations of diff. ops to inversion inspired me to climb the Cayley trees for a clear view of the landscape years ago. I guess I must put my nose to the grindstone to familiarize myself with stratified spaces so that I can feel it's intuitive.
Sep 19, 2014 at 21:03 comment added Qiaochu Yuan Can you give a bit more detail about how one goes from a Koszul duality between two operads to an observation about two generating functions being compositional inverses?
Sep 19, 2014 at 20:54 history edited Dan Petersen CC BY-SA 3.0
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Sep 19, 2014 at 20:36 history answered Dan Petersen CC BY-SA 3.0