papers

papers (chronological, or by topic)

on arxiv, on google scholar, on mathscinet


On the Okounkov-Olshanski formula for standard tableaux of skew shapes, with Daniel G. Zhu, 2020, arxiv:2007.05006, public cocalc worksheet, submitted

related extended abstract, poster at FPSAC 2020 Online


Counting linear extensions of posets with determinants of hook lengths, with Alexander Garver, Stefan Grosser, and Jacob Matherne, arxiv:2001.08822, submitted


Kostant's partition function and magic multiplex juggling sequences, with Carolina Benedetti, Christopher R. H. Hanusa, Pamela E. Harris, Anthony Simpson, arxiv:2001.03219, accepted Annals of Combinatorics


Factorization problems in complex reflection groups, with Joel Brewster Lewis, arxiv:1906.11961, accepted Canadian Journal of Mathematics,

related extended abstract, talk at FPSAC Slovenia 2019


Algebraic combinatorial Fourier and Legendre transforms with applications in perturbative quantum field theory, with David M. Jackson and Achim Kempf, arxiv:1805.09812, submitted


Asymptotics of principal evaluations of Schubert polynomials for layered permutations, with Igor Pak and Greta Panova, arxiv:1805.04341, Proceedings of the American Mathematical Society, Vol 147 (2019), 1377-1389


Asymptotics for the number of standard tableaux of skew shape and for weighted lozenge tilings, with Igor Pak and Martin Tassy, 2018, arxiv:1805.00992, submitted


A combinatorial model for computing volumes of flow polytopes, with Carolina Benedetti, Rafael S. González D'León, Christopher R. H. Hanusa, Pamela E. Harris, Apoorva Khare, and Martha Yip, 2018, arxiv:1801.07684, Transactions of the American Mathematical Society, 372 (2019), 3369-3404

related extended abstract, poster at FPSAC Dartmouth 2018


Volumes and Ehrhart polynomials of flow polytopes, with Karola Mészáros, arxiv:1710.00701, Mathematische Zeitschrift 293 (2019), 1369-1401, link,


Rook theory of the finite general linear group, with Joel Brewster Lewis, 2017, arxiv:1707.08192, Experimental Mathematics (2018), link


Hook formulas for skew shapes III. Multivariate and product formulas, with Igor Pak and Greta Panova, 2017, arxiv:1707.00931, Algebraic Combinatorics, Vol 2 (2019), 815-861 poster

related extended abstract, poster at FPSAC Dartmouth 2018


A robust generalization of the Legendre transform for QFT, with David M. Jackson and Achim Kempf, Journal of Physics A: Mathematical and Theoretical, Vol 50 (2017), arxiv:1612.00462, we build on the unpublished preprint arXiv:0810.4293


Flow polytopes and the space of diagonal harmonics, with Ricky I. Liu and Karola Mészáros, 2016, arxiv:1610.08370, Canadian Journal of Mathematics, 2018, link


Asymptotics for the number of standard Young tableaux of skew shape, with Igor Pak and Greta Panova, European Journal of Combinatorics, Vol 70 (2018), arxiv:1610.07561,

related article: Why is π < 2φ? The American Mathematical Monthly, Vol 125 (2018), 715-723, link


Hook formulas for skew shapes II. Combinatorial proofs and enumerative applications, with Igor Pak and Greta Panova, 2016, arxiv:1610.04744, SIAM Journal of Discrete Math (SIDMA), Vol 31 (2017), 1953–1989.


Efficient Routing for Cost Effective Scale-Out Data Architectures, with Ashwin Narayan, Vuk Marković, Natalia Postawa, Anna King, Alejandro Morales, Ashwin Kumar, Petros Efstathopoulos, 2016, short paper Proceedings 2016 IEEE MASCOTS, London, 424-429, IEEE:Xplore, arxiv:1606.08884


Hook formulas for skew shapes I. q-analogues and bijections, with Igor Pak and Greta Panova, 2015, arxiv:1512.08348, code, Journal of Combinatorial Theory Series A, Vol 154 (2018), 350-405

related extended abstract, poster at FPSAC Vancouver 2016


GLn(F_q)-analogues of factorization problems in the symmetric group, with Joel Brewster Lewis, 2015, arxiv:1511.00711, European Journal of Combinatorics, Vol 58 (2016) 75-95, preprint, related extended abstract, poster at FPSAC Canada 2016


On flow polytopes, order polytopes, and certain faces of the alternating sign matrix polytope, with Karola Mészáros and Jessica Striker, 2015, arXiv:1510.03357 (v2 significantly expanded, 2019), Discrete & Computational Geometry, Vol 62 (2019), 128–163


Probabilistic trees with algebraic roots, with Olivier Bernardi, Electronic Journal of Combinatorics, Vol 23, No 2 (2016), arXiv:1501.01135, code


The polytope of Tesler matrices, with Karola Mészáros and Brendon Rhoades, 2014, arXiv:1409.8566, B. Selecta Mathematica New Ser., Vol 23 (2017) 425, related extended abstract, presented talk at FPSAC Korea 2015


Combinatorics of diagrams of permutations, with Joel Brewster Lewis, 2014, arXiv:1405.1608, Journal of Combinatorial Theory Series A, Vol 137 (2016), 273-306, related extended abstract and poster FPSAC Chicago 2014; supplementary code and data (v2. has an appendix by Axel Hultman with a shorter elegant proof of part of Thm. 2.1)


New Dirac Delta function based methods with applications to perturbative expansions in quantum field theory and beyond, with Achim Kempf, David M. Jackson, Alejandro Morales, Journal of Physics A: Mathematical and Theoretical, Vol 47, No 41 (2014), arXiv:1404.0747, related article: How to (path) integrate by differentiating, Achim Kempf, David M. Jackson, Alejandro Morales, J. Phys.: Conf. Ser. 626 (2015), arxiv:1507.04348

    • update: This methods to integrate by differentiating have been implemented in Maple 2019 to compute Laplace and Fourier transforms and their inverses for a larger class of problems and to speed up other cases.


Structure and enumeration of (3+1)-free posets, with Mathieu Guay-Paquet and Eric Rowland, Annals of Combinatorics, Vol 18, No 4 (2014), 645-674, arXiv:1303.3652, related extended abstract, talk at FPSAC France 2013


Flow polytopes of signed graphs and the Kostant partition function, with Karola Mészáros, 2012, arXiv:1208.0140, International Mathematics Research Notices, No 3 (2015), 830-871. preprint,

related extended abstract, presented talk at FPSAC Japan 2012;


Counting trees using symmetries, with Olivier Bernardi, Journal of Combinatorial Theory Series A, Vol 123, No 1 (2014) 104-122, arXiv:1206.0598


Counting matrices over finite fields with support on skew Young diagrams and complements of Rothe diagrams

with Aaron J. Klein and Joel Brewster Lewis, Journal of Algebraic Combinatorics, Vol 39, No 2 (2014) 429-456, arXiv:1203.5804


Separation probabilities for products of permutations, with Olivier Bernardi, Richard P. Stanley and Rosena R. X. Du, Combinatorics Probability and Computing, Vol 23, No 2 (2014) 201-222, arXiv:1202.6471


Bijections and symmetries for the factorizations of the long cycle, with Olivier Bernardi, Advances in Applied Math, Vol 50, No 5 (2013) 702-722, arXiv:1112.4970


Bijective evaluation of the connection coefficients of the double coset algebra, with Ekaterina Vassilieva, 2010, arXiv:1011.5001, poster at FPSAC Iceland 2011


Matrices with restriced entries and q-analogues of permutations, with Joel Brewster Lewis, Ricky I. Liu, Greta Panova, Steven V Sam, Yan Zhang, Journal of Combinatorics, Vol 2, No 3 (2012) 355-396, arXiv:1011.4539;

related extended abstract, presented talk at FPSAC Iceland 2011


E7(7) constraints on counterterms in N=8 supergravity, with Niklas Beisert, Henriette Elvang, Daniel Z. Freedman, Michael Kiermaier, and Stephan Stieberger, Physics Letters B, Vol 694 No 3 (2010) 265-271,arXiv:1009.1643


Direct bijective computation of the generating series for 2 and 3-connection coefficients of the symmetric group, with Ekaterina Vassilieva, Electronic Journal of Combinatorics, Vol 20, No 2 (2013), arXiv:1101.3614

related extended abstract, poster at FPSAC Austria 2009


On the group-like behaviour of the Le-Murakami-Ohtsuki invariant, with David M. Jackson and Iain Moffatt, Journal of knot theory and its ramifications, Vol 16, No 6 (2007) 699-718, arXiv:QA/0511452


Phd thesis

Combinatorics of colored factorizations, flow polytopes, and matrices over finite fields, thesis, MIT 2012

Lecture notes (not edited by lecturers)

Math 206 Combinatorics of words: notes from course by Igor Pak, UCLA Fall 2014

Linear extensions of partially ordered sets: notes from minicourse by Richard Stanley, ECCO 2014, Bogota, June 2014.

- last updated: October 25, 2014

18.318 topics in combinatorics: Positive Grassmannian: typed notes from course by Alex Postnikov, MIT Spring 2012

(all files, images made using ipe, file to install it on a Mac)

- last updated: April 19, 2014

- shorter notes by Zvi Rosen from minicourse by Alex Postnikov in ECCO 2012.