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On the fibre product of incidence structures
Authors:Emanuel Kolb
Institution:(1) Fachbereich Mathematik, Technische Hochschule Darmstadt, D-64289 Darmstadt, Germany
Abstract:It is shown that in the category of incidence structures a fibre product (pull back) always exists. Several applications to Klingenberg incidence structures and divisible designs are given.Dedicated to Professor Johannes Böhm on the occasion of his 70th birthday
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