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2016

2016

Bárány, Katchalski and Pach (Proc Am Math Soc 86(1):109–114, 1982) (see also Bárány et al., Am Math Mon 91(6):362–365, 1984… Expand

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2012

2012

In 2005, Goodman and Pollack introduced the concept of an allowable interval sequence, a combinatorial object which encodes… Expand

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2011

2011

A circular arc graph is the intersection graph of a collection of connected arcs on the circle. We solve a Tur'an-type problem… Expand

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2011

2011

16 MAY 1916 * 30 MAY 2009EPHRAIM KATZIR-KATCHALSKI dedicated his life to science and to the State of Israel, all within the frame… Expand

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2008

2008

A fresh look is taken at the fractional Helly theorem for line transversals to families of convex sets in the plane. This theorem… Expand

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2007

2007

A family of disjoint closed congruent discs is said to have property T(3) if to every triple of discs there exists a common line… Expand

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2003

2003

Abstract. Let F be a family of disjoint unit balls in R3 . We prove that there is a Helly-number n0≤ 46 , such that if every n0… Expand

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1997

1997

A snake in a graph is a simple cycle without chords. We give an upper bound on the size of a snake S in then-dimensional cube of… Expand

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1990

1990

We prove that a finite family ℬ={B1,B2, ...,Bn} of connected compact sets in ℝd has a hyperplane transversal if and only if for… Expand

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1989

1989

We will prove that a finite family <italic>B</italic> = {<italic>B</italic><subscrpt>1</subscrpt>, <italic>B</italic><subscrpt>2… Expand

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