Volume 32, Issue 2 (2025)

What is a $4$-Connected Matroid?

Nick Brettell, Susan Jowett, James Oxley, Charles Semple, Geoff Whittle

P2.1
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Every Signed Planar Graph of Girth 5 Has Circular Chromatic Number Strictly Less Than 4

Jiaao Li, Xueliang Li, Zhiqian Wang

P2.2
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Fusions of the Tensor Product of a Strongly Regular Graph

Allen Herman, Neha Joshi

P2.3
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Rank Functions and Invariants of Delta-Matroids

Matt Larson

P2.4
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Signed Circuit $6$-Covers of Signed $K_4$-Minor-Free Graphs

You Lu, Rong Luo, Zhengke Miao, Cun-Quan Zhang

P2.5
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A Three-Regime Theorem for Flow-Firing

Sarah Brauner, Galen Dorpalen-Barry, Selvi Kara, Caroline Klivans, Lisa Schneider

P2.6
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Realizability in Matoušek Unique Sink Orientations: Characterization and Complexity Gap

Bernd Gärtner, Simon Weber, Joel Widmer

P2.7
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On the Order of P-Strict Promotion on $V\times [\ell]$

Ben Adenbaum

P2.8
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On the Order Sequence of a Group

Peter J. Cameron, Hiranya Kishore Dey

P2.9
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Reflection Groups and Quiver Mutation: Diagrammatics

Patrick Wegener

P2.10
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The Skew Immaculate Hecke Poset and 0-Hecke Modules

Nadia Lafrenière, Rosa Orellana, Anna Pun, Sheila Sundaram, Stephanie van Willigenburg, Tamsen Whitehead McGinley

P2.11
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Simplicial Complexes and Matroids with Vanishing $T^2$

Alexandru Constantinescu, Patricia Klein, Thái Thành Nguyễn, Anurag Singh, Lorenzo Venturello

P2.12
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Graphs with Large Clique Number whose Second Largest Eigenvalue does not Exceed $(\sqrt{5}-1)/2$

Muhuo Liu, Chaohui Chen, Zoran Stanić, Haiying Shan

P2.13
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Turán Colourings in Off-Diagonal Ramsey Multiplicity

Joseph Hyde, Jae-baek Lee, Jonathan A. Noel

P2.14
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Randomized Algorithms to Generate Hypergraphs with Given Degree Sequences

Michela Ascolese, Matthias Lienau, Matthias Schulte, Anusch Taraz

P2.15
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List Colorings of $k$-Partite $k$-Graphs

Abhishek Dhawan

P2.16
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Weighted Tree Games

Patrick Bennett, Alan Frieze

P2.17
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Generalized Spectral Characterization of Signed Trees

Yizhe Ji, Wei Wang, Hao Zhang

P2.18
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New Structures and their Applications to Variants of Zero Forcing and Propagation Time

Leslie Hogben, Mark Hunnell, Kevin Liu, Houston Schuerger, Ben Small, Yaqi Zhang

P2.19
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New Bounds on a Generalization of Tuza’s Conjecture

Alex Parker

P2.20
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A Random Coloring Process Gives Improved Bounds for the Erdős-Gyárfás Problem on Generalized Ramsey Numbers

Patrick Bennett, Andrzej Dudek, Sean English

P2.21
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Almost All 9-Regular Graphs Have a Modulo-5 Orientation

Michelle Delcourt, Reaz Huq, Paweł Prałat

P2.22
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On the $A_{\alpha}$-index of $C_4$-free graphs with given order or size

Yuantian Yu, Shuchao Li

P2.23
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Grid Minors and Products

Vida Dujmović, Pat Morin, David R. Wood, David Worley

P2.24
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A New Family of $(q^4+1)$-Tight Sets with an Automorphism Group $F_4(q)$

Tao Feng, Weicong Li, Qing Xiang

P2.25
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Long Cycles and Spectral Radii in Planar Graphs

Ping Xu, Huiqiu Lin, Longfei Fang

P2.26
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Avoidability Beyond Paths

Vladimir Gurvich, Matjaž Krnc, Martin Milanič, Mikhail Vyalyi

P2.27
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Edge Cover Through Edge Coloring

Guantao Chen, Songling Shan

P2.28
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Frozen Colourings in $2K_2$-free graphs

Manoj Belavadi, Kathie Cameron, Elias Hildred

P2.29
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On the Hyperdeterminants of Steiner Distance Hypermatrices

Ya-Nan Zheng

P2.30
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3-Cluster-Free Families of Subspaces

Gabriel Currier, Shahriar Shahriari

P2.31
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Sparse Vertex Cutsets and the Maximum Degree

Stéphane Bessy, Johannes Rauch, Dieter Rautenbach, Uéverton S. Souza

P2.32
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A Max-Min Problem on Spectral Radius and Connectedness of Graphs

Zhenzhen Lou, Changxiang He

P2.33
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Classification of Vertex-Transitive Digraphs of Order a Product of Two Distinct Primes via Automorphism Group

Ted Dobson, Ademir Hujdurović, Klavdija Kutnar, Joy Morris

P2.34
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Tangled Paths: A Random Graph Model from Mallows Permutations

Jessica Enright, Kitty Meeks, William Pettersson, John Sylvester

P2.35
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The Ascent Lattice on Dyck Paths

Jean-Luc Baril, Mireille Bousquet-Mélou, Sergey Kirgizov, Mehdi Naima

P2.36
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A Generalization of Conjugation of Integer Partitions

Seamus Albion, Theresia Eisenkölbl, Ilse Fischer, Moritz Gangl, Hans Höngesberg, Christian Krattenthaler, Martin Rubey

P2.37
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Detecting Graphical and Digraphical Regular Representations in Groups of Squarefree Order

Joy Morris, Gabriel Verret

P2.38
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Bounds for Greedy $B_h$-Sets

Kevin O'Bryant

P2.39
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Degree Deviation and Spectral Radius

Dieter Rautenbach, Florian Werner

P2.40
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On the Off-Diagonal Unordered Erdős-Rado Numbers

Igor Araujo, Dadong Peng

P2.41
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A Mathon-Type Construction for Digraphs and Improved Lower Bounds for Ramsey Numbers

Dermot McCarthy, Chris Monico

P2.42
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New Bounds on Families without Large Sunflowers

Peter Frankl, Jian Wang

P2.43
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Uniform Recurrence in the Motzkin Numbers and Related Sequences mod $p$

Nadav Kohen

P2.44
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How to Get the Random Graph with Non-Uniform Probabilities?

Leonardo N. Coregliano, Jarosław Swaczyna, Agnieszka Widz

P2.45
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A Combinatorial Proof of a Symmetry for a Refinement of the Narayana Numbers

Miklós Bóna, Stoyan Dimitrov, Gilbert Labelle, Yifei Li, Joseph Pappe, Andrés R. Vindas-Meléndez, Yan Zhuang

P2.46
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Generalized Quaternion Groups with the $m$-DCI Property

Jinhua Xie, Yan-Quan Feng, Binzhou Xia

P2.47
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The Latin Tableau Conjecture

Timothy Y. Chow, Mark G. Tiefenbruck

P2.48
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Stability of Cayley Graphs and Schur Rings

Ademir Hujdurović, István Kovács

P2.49
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Lexicographic Shellability of Sects

Aram Bingham, Néstor Fernando Díaz Morera

P2.50
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Bijectivizing the PT–DT Correspondence

Cruz Godar, Benjamin Young

P2.51
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The Largest Size of $(t,t+d,t+2d)$-Core Partitions

Hyunsoo Cho, Kyeongjun Lee, Hayan Nam

P2.52
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A Variable Version of the Quasi-Kernel Conjecture

Jiangdong Ai, Xiangzhou Liu, Fei Peng

P2.53
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Weak Bruhat Interval Modules of Finite-Type $0$-Hecke Algebras and Projective Covers

Joshua Bardwell, Dominic Searles

P2.54
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The Repetition Threshold for Ternary Rich Words

James D. Currie, Lucas Mol, Jarkko Peltomäki

P2.55
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Covering Numbers of Some Irreducible Characters of the Symmetric Group

Rijubrata Kundu, Velmurugan S

P2.56
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