Séminaire Lotharingien de Combinatoire, B61Al (2010), 23 pp.
Luca Ferrari and Pierre Leroux
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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