#####
Séminaire Lotharingien de Combinatoire, B26h (1991).

[Formerly: Publ. I.R.M.A. Strasbourg, 1992, 476/S-26, p.
49-53.]

# Henning Krause

# Endomorphisms of Words in a Quiver

**Abstract.**
We present a purely combinatorial concept which has been useful
in the representation theory of finite dimensional algebras. First we extend
the classical concept of a word in an alphabet (as discussed for instance
in the book of M. Lothaire) to that of a word in a quiver.
Then the endomorphisms of such a word are defined. They form a monoid
which provides some information about recurrence and periodicity
of the fixed word.

The paper has been finally published under the same title in
*J. Combin. Theory Ser. A* **64** (1993), 216-245.