Publications de Bartosz Maria Walczak

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Decomposition of Multiple Packings with Subquadratic Union Complexity

János Pach, Bartosz Maria Walczak

Suppose k is a positive integer and X is a k-fold packing of the plane by infinitely many arc-connected compact sets, which means that every point of the plane belongs to at most k sets. Suppose there is a function f(n) = o(n(2)) with the property that any ...

Cambridge Univ Press2016

Triangle-free intersection graphs of line segments with large chromatic number

Bartosz Maria Walczak, Michal Lason

In the 1970s Erdos asked whether the chromatic number of intersection graphs of line segments in the plane is bounded by a function of their clique number. We show the answer is no. Specifically, for each positive integer k we construct a triangle-free fam ...

Academic Press Inc Elsevier Science2014

Coloring Intersection Graphs of Arc-Connected Sets in the Plane

Bartosz Maria Walczak, Michal Lason

A family of sets in the plane is simple if the intersection of any subfamily is arc-connected, and it is pierced by a line L if the intersection of any member with L is a nonempty segment. It is proved that the intersection graphs of simple families of com ...

Springer2014

Outerplanar graph drawings with few slopes

Bartosz Maria Walczak

We consider straight-line outerplanar drawings of outerplanar graphs in which a small number of distinct edge slopes are used, that is, the segments representing edges are parallel to a small number of directions. We prove that Delta - 1 edge slopes suffic ...

Elsevier Science Bv2014

An extremal problem on crossing vectors

Bartosz Maria Walczak, Michal Lason

For positive integers w and k, two vectors A and B from Z(w) are called k-crossing if there are two coordinates i and j such that A[i] - B[i] >= k and B[j] - A[j] >= k. What is the maximum size of a family of pairwise 1-crossing and pairwise non-k-crossing ...

Academic Press Inc Elsevier Science2014

Triangle-Free Geometric Intersection Graphs with Large Chromatic Number

Bartosz Maria Walczak, Michal Lason

Several classical constructions illustrate the fact that the chromatic number of a graph may be arbitrarily large compared to its clique number. However, until very recently no such construction was known for intersection graphs of geometric objects in the ...

Springer US2013

New Bounds on the Maximum Number of Edges in k-Quasi-Planar Graphs

Bartosz Maria Walczak

A topological graph is k-quasi-planar if it does not contain k pairwise crossing edges. An old conjecture states that for every fixed k, the maximum number of edges in a k-quasi-planar graph on n vertices is O(n). Fox and Pach showed that every k-quasi-pla ...

Springer International Publishing2013

Bartosz Maria Walczak

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Decomposition of Multiple Packings with Subquadratic Union Complexity

Triangle-free intersection graphs of line segments with large chromatic number

Coloring Intersection Graphs of Arc-Connected Sets in the Plane

Outerplanar graph drawings with few slopes

An extremal problem on crossing vectors

Triangle-Free Geometric Intersection Graphs with Large Chromatic Number

Coloring Triangle-Free Rectangular Frame Intersection Graphs with O(loglogn) Colors

New Bounds on the Maximum Number of Edges in k-Quasi-Planar Graphs

Outerplanar graph drawings with few slopes

Triangle-free intersection graphs of line segments with large chromatic number

Decomposition of Multiple Packings with Subquadratic Union Complexity

New Bounds on the Maximum Number of Edges in k-Quasi-Planar Graphs

Triangle-Free Geometric Intersection Graphs with Large Chromatic Number

Coloring Intersection Graphs of Arc-Connected Sets in the Plane

An extremal problem on crossing vectors

Coloring Triangle-Free Rectangular Frame Intersection Graphs with O(loglogn) Colors