Volume 28, Issue 4 (2021)

The Rotor-Routing Torsor and the Bernardi Torsor Disagree for Every Non-Planar Ribbon Graph

Changxin Ding

P4.1
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The Bernardi Formula for Nontransitive Deformations of the Braid Arrangement

Ankit Bisain, Eric J. Hanson

P4.2
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Edge-Disjoint Branchings in Temporal Digraphs

Victor Campos, Raul Lopes, Andrea Marino, Ana Silva

P4.3
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The Maximum Number of Copies of $K_{r,s}$ in Graphs Without Long Cycles or Paths

Changhong Lu, Long-Tu Yuan, Ping Zhang

P4.4
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Jones' Conjecture in Subcubic Graphs

Marthe Bonamy, François Dross, Tomáš Masařík, Andrea Munaro, Wojciech Nadara, Marcin Pilipczuk, Michał Pilipczuk

P4.5
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Two Results on Ramsey-Turán Theory

Meng Liu, Yusheng Li

P4.6
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Normal Polytopes and Ellipsoids

Joseph Gubeladze

P4.7
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Removahedral Congruences versus Permutree Congruences

Doriann Albertin, Vincent Pilaud, Julian Ritter

P4.8
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Counting Non-Crossing Permutations on Surfaces of any Genus

Norman Do, Jian He, Daniel V. Mathews

P4.9
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The Erdős-Ko-Rado Theorem for 2-Pointwise and 2-Setwise Intersecting Permutations

Karen Meagher, A. Sarobidy Razafimahatratra

P4.10
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Cameron-Liebler $k$-sets in $\mathrm{AG}(n,q)$

Jozefien D'haeseleer, Ferdinand Ihringer, Jonathan Mannaert, Leo Storme

P4.11
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Characterizations of the $G_2(4)$ and $L_3(4)$ Near Octagons

Bart De Bruyn

P4.12
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A Graph Theory of Rook Placements

Kenneth Barrese

P4.13
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Some Applications of Wagner's Weighted Subgraph Counting Polynomial

Ferenc Bencs, Péter Csikvári, Guus Regts

P4.14
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Zero-Sum Squares in Bounded Discrepancy $\{-1,1\}$-Matrices

Alma R. Arévalo, Amanda Montejano, Edgardo Roldán-Pensado

P4.15
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Matching Complexes of $3 \times n$ Grid Graphs

Shuchita Goyal, Samir Shukla, Anurag Singh

P4.16
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Principal Specialization of Dual Characters of Flagged Weyl Modules

Karola Mészáros, Avery St. Dizier, Arthur Tanjaya

P4.17
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Toppling on Permutations with an Extra Chip

Arvind Ayyer, Beáta Bényi

P4.18
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Nonrepetitively 3-Colorable Subdivisions of Graphs with a Logarithmic Number of Subdivisions per edge

Matthieu Rosenfeld

P4.19
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Saturation Number of $tK_{l,l,l}$ in the Complete Tripartite Graph

Zhen He, Mei Lu

P4.20
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A Characteristic Polynomial for the Transition Probability Matrix of Correlated Random Walks on a Graph

Takashi Komatsu , Norio Konno, Iwao Sato

P4.21
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Improved Packings of $n(n − 1)$ Unit Squares in a Square

M. Z. Arslanov, S. A. Mustafin, Z. K. Shangitbayev

P4.22
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On Factors of Independent Transversals in $k$-Partite Graphs

Raphael Yuster

P4.23
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Bell Polynomials and Nonlinear Inverse Relations

Wenchang Chu

P4.24
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Transversals and Bipancyclicity in Bipartite Graph Families

Peter Bradshaw

P4.25
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Resolutions of Convex Geometries

Domenico Cantone, Jean-Paul Doignon, Alfio Giarlotta, Stephen Watson

P4.26
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Popular Differences for Right Isosceles Triangles

Vjekoslav Kovač

P4.27
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Transitive Avoidance Games on Boards of Odd Size

Matthias Gehnen, Eberhard Triesch

P4.28
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Bijections for Faces of the Shi and Catalan Arrangements

Duncan Levear

P4.29
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Asymptotic Properties of Random Unlabelled Block-Weighted Graphs

Benedikt Stufler

P4.30
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Biconed Graphs, Weighted Forests, and $h$-Vectors of Matroid Complexes

Preston Cranford, Anton Dochtermann, Evan Haithcock, Joshua Marsh, Suho Oh, Anna Truman

P4.31
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Generalized Planar Turán Numbers

Ervin Győri, Addisu Paulos, Nika Salia, Casey Tompkins, Oscar Zamora

P4.32
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On Bipartite Distinct Distances in the Plane

Surya Mathialagan

P4.33
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Paths of Length Three are $K_{r+1}$-Turán-Good

Kyle Murphy, JD Nir

P4.34
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Cycles in Color-Critical Graphs

Benjamin R. Moore, Douglas B. West

P4.35
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On the Number of Sum-Free Triplets of Sets

Igor Araujo, József Balogh, Ramon I. Garcia

P4.36
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Generalizations and Strengthenings of Ryser's Conjecture

Louis DeBiasio, Yigal Kamel, Grace McCourt, Hannah Sheats

P4.37
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Twenty Vertex Model and Domino Tilings of the Aztec Triangle

Philippe Di Francesco

P4.38
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The Exact Linear Turán Number of the Sail

Beka Ergemlidze, Ervin Győri, Abhishek Methuku

P4.39
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Diameters of Cocircuit Graphs of Oriented Matroids: An Update

Ilan Adler, Jesús A. De Loera, Steven Klee, Zhenyang Zhang

P4.40
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A Survey of the Hadamard Maximal Determinant Problem

Patrick Browne, Ronan Egan, Fintan Hegarty, Padraig Ó Catháin

P4.41
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$r$-Critical Numbers of Natural Intervals

Marcel Herzog, Gil Kaplan, Arieh Lev, Romina Zigdon

P4.42
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On Automorphisms of the Double Cover of a Circulant Graph

Ademir Hujdurović, Đorđe Mitrović, Dave Witte Morris

P4.43
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A Combinatorial Formula for Kazhdan-Lusztig Polynomials of Sparse Paving Matroids

Kyungyong Lee, George D. Nasr, Jamie Radcliffe

P4.44
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Thin Distance-Regular Graphs with Classical Parameters $(D,q,q, \frac{q^{t}-1}{q-1}-1)$ with $t> D$ are the Grassmann Graphs

Xiaoye Liang, Ying-Ying Tan, Jack Koolen

P4.45
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Integral Mixed Cayley Graphs over Abelian Groups

Monu Kadyan, Bikash Bhattacharjya

P4.46
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Smaller Extended Formulations for Spanning Tree Polytopes in Minor-Closed Classes and Beyond

Manuel Aprile, Samuel Fiorini, Tony Huynh, Gwenaël Joret, David R. Wood

P4.47
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A Combinatorial Bijection on di-sk Trees

Shishuo Fu, Zhicong Lin, Yaling Wang

P4.48
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Automorphisms and Some Geodesic Properties of Ortho-Grassmann Graphs

Mark Pankov, Krzysztof Petelczyc, Mariusz Źynel

P4.49
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The Choice Number Versus the Chromatic Number for Graphs Embeddable on Orientable Surfaces

Brahadeesh Sankarnarayanan, Niranjan Balachandran

P4.50
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Periodic Solutions of One-Dimensional Cellular Automata with Uniformly Chosen Random Rules

Janko Gravner, Xiaochen Liu

P4.51
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Pattern Avoidance Over a Hypergraph

Benjamin Gunby, Maxwell Fishelson

P4.52
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Regarding Two Conjectures on Clique and Biclique Partitions

Dhruv Rohatgi, John C. Urschel, Jake Wellens

P4.53
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Combinatorial Game Distributions of Steiner Systems

Yuki Irie

P4.54
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A New Algorithm for Embedding Plane Graphs at Fixed Vertex Locations

Marcus Schaefer

P4.55
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