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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…

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…

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…

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…

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…

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…

1989

1989

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…

1986

1986

We show that every graph G on n vertices with minimal degree at least n/k contains a cycle of length at least [n/(k − 1)]. This…

1955

1955

POLYELECTROLYTES of high molecular weight have been shown to inhibit a variety of enzymes in what Spensley and Rogers1 have…