Séminaire Lotharingien de Combinatoire, B61Al (2010), 23 pp.

Luca Ferrari and Pierre Leroux

ECO Species

Abstract. We introduce the notion of ECO species, by means of which we are able to translate the ECO method into the language of (linear) species. We then define many operations on ECO species, reflecting the most common operations on the associated generating functions, and give examples illustrating such operations.

Received: October 21, 2009. Revised: October 5, 2010. Accepted: November 17, 2010.

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