#####
Séminaire Lotharingien de Combinatoire, B29f (1992), 7
pp.

[Formerly: Publ. I.R.M.A. Strasbourg, 1993, 1993/033, p.
43-49.]

# M. Hofmeister

# Combinatorial Aspects of an Exact Sequence
That Is Related to a Graph

**Abstract.**
The five problems of counting component colorings, vertex colorings, arc colorings,
cocycles, and switching equivalence classes of a graph with respect to a finite field
up to isomorphism are related by an exact sequence that stems from a coboundary operator.
This cohomology is presented, and counting formulas are given for each of the five problems.

Siemens AG, München

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