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Updates, errata, & commentary

Please feel free to contact me with questions, comments, or mistakes.

Comment on combinatorial journals. September 2025
Someone expressed to me confusion regarding two important combinatorics journals. Matters stand as follows: the editors of former flagships Journal of Algebraic Combinatorics and Journal of Combinatorial Theory, Series A resigned en masse in 2017 and 2020, respectively. They founded replacement journals Algebraic Combinatorics and Combinatorial Theory, which are where you should now submit papers (the originals are zombies). Editors at many other journals are moving likewise, e.g. Experimental Mathematics is now dead, replaced by the Journal of Experimental Mathematics. See here for more examples.

Clarification to [BES24]. March 2025
Sridhar Venkatesh observed that the definition of M-convexity given on page 25 is subtlely different from the one used in the proof of Proposition 5.3.3. Happily, the two definitions are equivalent by [Mur03, Section 4.2].

Error in [BES24]. March 2025
Matt Larson pointed out that the statement of Proposition 5.2.3 is false. A correction is on arXiv; main results are unaffected.

Clarification to [BES24]. January 2024
In an arXiv update, we have expanded the proof of Lemma 3.3.10, following comments by Matt Larson.

References.

[BES24]

Spencer Backman, Christopher Eur, and Connor Simpson. “Simplicial generation of Chow rings of matroids”. J. Eur. Math. Soc. (JEMS) 26.11 (2024), pp. 4491–4535. arXiv: 1905.07114.

[Mur03]

Kazuo Murota. Discrete Convex Analysis. Discrete Mathematics and Applications. Society for Industrial and Applied Mathematics, Jan. 2003. 406 pp. isbn: 978-0-89871-540-8. url: https://epubs.siam.org/doi/book/10.1137/1.9780898718508.

Last update. March 21, 2025