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**Zentralblatt MATH**

**Publications of (and about) Paul Erdös**

**Zbl.No: ** 872.05020

**Autor: ** Erdös, Paul

**Title: ** Some old and new problems in various branches of combinatorics. (In English)

**Source: ** Discrete Math. 165-166, 227-231 (1997).

**Review: ** This note consists of a list of about twenty open old and new questions formulated by the late Paul Erdös and some of his friends. Most of these are extremal problems in graph theory. Others have to do with divisibility properties of sequences and with discrete geometry.

**Reviewer: ** S.Stahl (Lawrence)

**Classif.: ** * 05C35 Extremal problems (graph theory)

00A07 Problem books

05-99 Combinatorics

52-99 Convex and discrete geometry

11B75 Combinatorial number theory

52C10 Erdoes problems and related topics of discrete geometry

**Keywords: ** extremal problems; divisibility; sequences; discrete geometry

© European Mathematical Society & FIZ Karlsruhe & Springer-Verlag