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A PROP is a way of encoding structure borne by an object of a symmetric monoidal category. We describe a notion of distributive law for PROPs, based on Beck's distributive laws for monads. A distributive law between PROPs allows them to be composed, and an algebra for the composite PROP consists of a single object with an algebra structure for each of the original PROPs, subject to compatibility conditions encoded by the distributive law. An example is the PROP for bialgebras, which is a composite of the PROP for coalgebras and that for algebras.
@article{TAC_2004_13_a8, author = {Stephen Lack}, title = {Composing {PROPs}}, journal = {Theory and applications of categories}, pages = {147--163}, publisher = {mathdoc}, volume = {13}, year = {2004}, language = {en}, url = {http://geodesic.mathdoc.fr/item/TAC_2004_13_a8/} }
Stephen Lack. Composing PROPs. Theory and applications of categories, The Carboni Festschrift, Tome 13 (2004), pp. 147-163. http://geodesic.mathdoc.fr/item/TAC_2004_13_a8/