Combinatorics's Avatar

Combinatorics

@combinatorics.bsky.social

This is the "official account" of the mathematics research field "Combinatorics". This account can be given around to combinatorialists around the world for one week each to post about their view on the field. DMs are open for requests.

150 Followers  |  155 Following  |  8 Posts  |  Joined: 30.10.2023  |  1.5911

Latest posts by combinatorics.bsky.social on Bluesky

Enumerative #Combinatorics principle:

Whenever you have an integer sequence (a_n) for which every a_n has only small prime factors, there is a product counting formula behind it.

Meta reason:

Numbers do not only have small prime factors by coincidence. There is a reason behind it.

#MathSky #Math

09.02.2025 08:25 — 👍 3    🔁 0    💬 1    📌 0

In combinatorics, this is a *linear extension*. And the analogue of the existence statement is

"A directed graph defines a poset if and only if the graph is acyclic".

#combinatorics #mathsky

14.01.2025 07:04 — 👍 8    🔁 0    💬 0    📌 0
Geometric local systems on very general curves and isomonodromy, JAMS

Geometric local systems on very general curves and isomonodromy, JAMS

Canonical representations of surface groups, Annals

Canonical representations of surface groups, Annals

I've recently been talking a bit about how difficult it is to carefully check even well-written mathematics. I want to try to explain something about this by telling the story of some errors in the literature that (in part) led to the two papers below. 1/n

01.01.2025 22:28 — 👍 298    🔁 70    💬 7    📌 28
Post image

Please help, my cookies are approximating a Voronoi tessellation.

15.12.2024 12:56 — 👍 77    🔁 2    💬 3    📌 0

In one year, the Institute for Computational and Experimental Research in Mathematics (ICERM) will have the following exciting program:

Categorification and Computation in Algebraic Combinatorics
Sep 3 - Dec 5, 2025
icerm.brown.edu/program/seme...

#Mathematics #Combinatorics #MathSky

05.12.2024 10:21 — 👍 10    🔁 3    💬 0    📌 1
Post image

D&D Combinatorics xkcd.com/3015

23.11.2024 00:59 — 👍 27089    🔁 2179    💬 203    📌 109
The Australasian Journal of Combinatorics AJC - The Australasian Journal of Combinatorics

* Australasian Journal of Combinatorics (ajc.maths.uq.edu.au)

22.11.2024 09:55 — 👍 2    🔁 1    💬 0    📌 0

* Electronic Journal of Combinatorics (www.combinatorics.org)

* Algebraic Combinatorics (alco.centre-mersenne.org)

Feel free to add more in the comments!

#Mathematics #Combinatorics #OpenAccess #MathSky #MathJournals #Research

2/2

22.11.2024 09:23 — 👍 8    🔁 0    💬 1    📌 0

Do you want to publish your Combinatorics research in diamond open access journals, with no fees for authors or readers ?

Here are some first great options to consider:

* Combinatorial Theory, which has a double-anonymous review process (combinatorial-theory.org)

1/2

22.11.2024 09:23 — 👍 9    🔁 3    💬 1    📌 0

Sure you can. I'd give it a try.

21.11.2024 14:00 — 👍 1    🔁 0    💬 0    📌 0

Combinatorics is a research field for the future!

"We've got this feeling that there's a whole extraordinary talented generation coming up"

20.11.2024 15:03 — 👍 0    🔁 0    💬 0    📌 0

Dear Combinatorialists around the world

This account is still empty, but we hope the combinatorics community to grow!

You are all invited to take over this account for a week or two to share your views on combinatorics.

#Combinatorics #Mathematics #MathSky

20.11.2024 14:56 — 👍 5    🔁 2    💬 1    📌 0

@combinatorics is following 20 prominent accounts