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Budapest Big Combinatorics + Geometry Seminar

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Steiner symmetrization on the sphere

Lángi Zsolt
on 10/4/24

Random gems

Spencer Joel
on 5/17/24

Forbidden acyclic patterns in 0-1 matrices

Tardos Gábor
on 5/3/24

The discrete Pompeiu problem in R^k$ and its consequences

Kiss Gergely
on 4/26/24

A covering problem for Coxeter permutahedra

Károlyi Gyula
on 4/19/24

Honeycomb Conjecture in normed planes and an alpha-convex variant of Dowker's theorem

Lángi Zsolt
on 4/12/24

Lower bounds for incidences

Zakharov Dmitrii
on 4/5/24

Number of digons in arrangements of pairwise intersecting pseudo-circles

Gábor Damásdi
on 3/22/24

Almost optimal packings of equal spheres in dimensions 8 and 24

Böröczky Károly
on 3/8/24

Canonical results in Ramsey theory

Sagdeev Arsenii
on 3/1/24

Crossing numbers of crossing-critical graphs

Tóth Géza
on 2/23/24

Additive structure in convex translates

Solymosi József
on 1/19/24

On cliques in three-dimensional dense point-line arrangements

Ji Zeng
on 12/7/23

On the number of tangencies among 1-intersecting x-monotone curves

Keszegh Balázs
on 11/30/23

Spread approximations and forbidden subconfigurations

Andrey Kupavskii
on 11/2/23

Planarity and dimension

Piotr Micek
on 10/26/23

Contact graphs of totally separable packings

Konrad Swanepoel
on 10/19/23

Higher rank antipodality

Márton Naszódi
on 10/12/23

Which Problem to solve and how to solve it? -- Let the algorithm decide everything!

Adrian Dumitrescu
on 10/5/23

Reconfiguration of Polygonal Subdivisions via Recombination

Csaba Tóth
on 9/28/23

Reuniting chi-boundedness with polynomial chi-boundedness

James Davies
on 9/21/23

Lattice paths with states, and counting geometric objects via production matrices

Günter Rote
on 9/13/23

Asymptotic expansions for generalized random polygons

Ferenc Fodor
on 5/5/23

Geometric constructions via random sampling

Istvan Tomon
on 4/28/23

Colorful vector balancing

Rainie Bozzai
on 4/21/23

Unit and distinct distances in typical norms

Matija Bucic
on 4/14/23

From crossings to areas and back

Alfredo Hubard
on 4/7/23

An improved algorithm to construct spanning paths with low crossing numbers

Csikos Monika
on 3/31/23

On a traveling salesman problem for points in the unit cube

Adrian Dumitrescu
on 3/24/23

Quantitative Steinitz theorems

Naszodi Marton
on 3/17/23

Improved Algebraic Degeneracy Testing

Jean Cardinal
on 3/10/23

Gergely Ambrus: Critical central sections of the cube

Ambrus Gergely
on 3/3/23

Adrian Dumitrescu: Peeling Sequences

Dumitrescu Adrian
on 2/24/23

Gábor Kun: A polynomial removal lemma for posets

Kun Gábor
on 2/17/23

Arsenii Sagdeev: Cutting corners

Sagdeev Arsenii
on 2/10/23

István Lénárt: The Right Triangle as the Simplex in 2D Euclidean Space, Generalized to n Dimensions

Lénárt István
on 12/16/22

António Girão: Monotone Arrays And A Multidimensional Ramsey Theorem

Girão António
on 12/9/22

James Davies: Odd distances in colourings of the plane

Davies James
on 12/2/22

Barnabás Janzer: Rotation inside convex Kakeya sets

Janzer Barnabás
on 11/25/22

József Solymosi: On the structure of pointsets with many collinear triples

Solymosi József
on 11/18/22

András Gyárfás: Two Ramsey problems on vertex-ordered complete graphs inspired by twisted drawings

Gyárfás András
on 11/4/22

Benny Sudakov: Evasive sets, covering by subspaces, and point-hyperplane incidences

Sudakov Benny
on 10/28/22

Grigory Ivanov: Geometric representation of 1 / s -concave functions and duality

Ivanov Grigory
on 10/21/22

Natan Rubin: Two questions on crossings in geometric (hyper-)graphs

Rubin Natan
on 10/14/22

Dömötör Pálvölgyi: C-P3O: Orientation of convex sets and other good covers

Pálvölgyi Dömötör
on 10/7/22

Soumi Nandi: Colorful Helly theorem for piercing boxes with two points

Nandi Soumi
on 9/30/22

Máté Matolcsi and Dániel Varga: The density of planar sets avoiding unit distances

Matolcsi Máté
on 9/23/22

Dmitriy Zakharov: Convex polytopes from fewer points

Zakharov Dmitry
on 9/16/22

Matthew Kendall: Quantitative Helly-type theorems via sparse approximation

Kendall Matthew
on 8/26/22

Károly Bezdek: On the separable Tammes problem

Bezdek Károly
on 5/20/22

Balázs Keszegh: The number of tangencies between two families of curves

Keszegh Balázs
on 5/13/22

István Miklós: Fast transformations of Latin squares, half-regular factorizations and edge colorings of bipartite graphs in small steps

Miklós István
on 5/6/22

Artem Zvavitch: Volume product and Mahler conjecture for convex bodies

Zvavitch Artem
on 4/29/22

Manfred Scheucher: Erdős-Szekeres-type problems in the real projective plane

Scheucher Manfred
on 4/22/22

Xavier Goaoc: No weak epsilon nets for lines and convex sets in space

Goaoc Xavier
on 4/8/22

Vsevolod Voronov: On the chromatic number of 2-dimensional spheres

Voronov Vsevolod
on 4/1/22

Daniel McGinnis: A family of convex sets in the plane satisfying the ( 4 , 3 ) -property can be pierced by nine points.

McGinnis Daniel
on 3/25/22

Márió Szegedy: Budgeted Steiner Networks: Three Terminals with Equal Path Weights

Szegedy Márió
on 3/18/22

Nicolas Bousquet: Fast transformations between colorings

Bousquet Nicolas
on 3/11/22

Imre Bárány: Orientation preserving maps of the n by n grid

Bárány Imre
on 3/4/22

Sophie Spirkl: A counterexample to a conjecture about triangle-free induced subgraphs of graphs with large chromatic number

Spirkl Sophie
on 2/25/22

Márton Naszódi: Löwner's problem for log-concave functions and beyond

Naszódi Márton
on 2/18/22

Alexandr Polyanskii: Polynomial plank covering problem

Polyanskii Alexandr
on 2/11/22

Fejes Tóth Gábor: Emlékezés Heppes Aladárra

Fejes Tóth Gábor
on 12/17/21

David Conlon: Difference sets in higher dimensions

Conlon David
on 12/10/21

Gergely Ambrus: Piercing the chessboard

Ambrus Gergely
on 12/3/21

Oscar Ortega Moreno: The complex plank problem and Fejes Toth's zone conjecture, revisited.

Ortega Moreno Oscar
on 11/26/21

Attila Pór: Universal order type of lines/k-flats in R^d

Pór Attila
on 11/19/21

János Barát: Saturated k-plane graphs and k-planar drawings with special emphasis on k=2

Barát János
on 11/5/21

András Bezdek: On colored variants of some two-player games

Bezdek András
on 10/15/21

Zsolt Lángi: An isoperimetric problem for three-dimensional parallelohedra

Lángi Zsolt
on 10/8/21

Dömötör Pálvölgyi: 666-uniform Unit Disk Hypergraphs are 3-colorable

Pálvölgyi Dömötör
on 9/24/21

Károly Bezdek: More on contact numbers of unit sphere packings

Bezdek Károly
on 5/21/21

Balázs Keszegh: On tangencies among planar curves

Keszegh Balázs
on 5/14/21

Chaya Keller: On multicolor Ramsey numbers and subset-coloring of hypergraphs

Keller Chaya
on 5/7/21

Imre Bárány: Erdős-Szekeres theorems for k-flats

Bárány Imre
on 4/30/21

Endre Csóka: Upper bounds for the necklace folding problems

Csóka Endre
on 4/16/21

Madhu Sudan: (Deterministic) Communication Amid Uncertainty

Sudan Madhu
on 4/2/21

Pablo Soberón: Quantitative Helly theorems

Soberón Pablo
on 3/26/21
01:22:00

Ramon van Handel: Some unusual extremal problems in convexity and combinatorics

van Handel Ramon
on 3/19/21
01:04:00

James Davies: Circle graphs are quadratically chi-bounded

Davies James
on 3/5/21
01:18:00

Wolfgang Mulzer: Long Alternating Paths Exist

Mulzer Wolfgang
on 2/26/21
01:00:00

Barak Weiss: New bounds on the covering density of lattices

Weiss Barak
on 2/19/21

Sergey Avvakumov: A subexponential size R P n

Avvakumov Sergey
on 2/12/21
01:19:00

Natan Rubin: Stronger bounds for weak Epsilon-Nets

Rubin Natan
on 2/5/21
01:06:00

David Wood: Universal Graph Product Structures

Wood David
on 12/4/20
01:05:00

Oscar Ortega Moreno: An optimal plank problem

Ortega Moreno Oscar
on 11/27/20
01:10:00

Jacques Verstraete: Extremal problems for geometric hypergraphs

Verstraete Jacques
on 11/20/20
01:16:00

Andrey Kupavskii: Binary scalar products

Kupavskii Andrey
on 11/13/20
00:47:00

Zsolt Lángi: A solution to some problems of Conway and Guy on monostable polyhedra

Lángi Zsolt
on 11/6/20
01:21:00

Márton Naszódi: Computing the Covering Radius with an Application to the Lonely Runner Conjecture

Naszódi Márton
on 10/30/20
01:39:00

Micha Sharir: Eliminating depth cycles and its relatives

Sharir Micha
on 10/16/20
01:16:00

Péter Ágoston: A lower bound on the number of colours needed to nicely colour a sphere

Ágoston Péter
on 10/9/20
01:10:00

Andreas Holmsen: Extensions of the (p,q) theorem

Holmsen Andreas
on 10/2/20
01:17:00

Gábor Damásdi: Odd wheels are not odd-distance graphs

Damásdi Gábor
on 9/25/20
01:05:00

Claude Tardif: The chromatic number of the product of 15-chromatic graphs can be 14

Tardif Claude
on 9/18/20
01:27:00

Xuding Zhu: Hedetniemi's conjecture and the Poljak-Rödl function

Zhu Xuding
on 9/11/20