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# Isomorphism Invariants for Projective Configurations

Published:1999-12-01
Printed: Dec 1999
• G. C. Shephard
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## Abstract

An isomorphism invariant is an expression, defined for a configuration in the projective plane, which takes the same value for all isomorphic configurations. Examples are given as well as a general method (Nehring sequences) for constructing such invariants.
 MSC Classifications: 51N15 - Projective analytic geometry