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**Monounary algebras.**
*(English)*
Zbl 1181.08001

Košice: Pavol Jozef Šafárik University (ISBN 978-80-7097-763-7/pbk). 302 p. (2009).

This monograph is written by two experts in the field. It fills a gap in the literature by bringing together the most important facts known about monounary algebras. The subject is treated in detail and the book gives a good overview on the research results obtained so far. The exposition is clear and well readable and the text is illustrated by numerous diagrams. The chapters include the following material: homomorphisms, congruences, subalgebras, products, retracts, retract lattices, retract irreducibility and classes of monounary algebras as well as related structures. A bibliography and an index are included. The book is of interest not only for algebraists but also for people working in theoretical computer science.

Reviewer: Helmut Länger (Wien)

### MSC:

08-02 | Research exposition (monographs, survey articles) pertaining to general algebraic systems |

08A60 | Unary algebras |