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Recent investigations of lax algebras - in generalization of Barr's relational algebras -make an essential use of lax extensions of monad functors on Set to the category Rel(V) of sets and V-relations (where V is a unital quantale). For a given monad there may be many such lax extensions, and different constructions appear in the literature. The aim of this article is to shed a unifying light on these lax extensions, and present a symptomatic situation in which distinct monads yield isomorphic categories of lax algebras.
@article{TAC_2008_21_a6, author = {Christoph Schubert and Gavin J. Seal}, title = {Extensions in the theory of lax algebras}, journal = {Theory and applications of categories}, pages = {118--151}, publisher = {mathdoc}, volume = {21}, year = {2008}, language = {en}, url = {http://geodesic.mathdoc.fr/item/TAC_2008_21_a6/} }
Christoph Schubert; Gavin J. Seal. Extensions in the theory of lax algebras. Theory and applications of categories, The Tholen Festschrift, Tome 21 (2008), pp. 118-151. http://geodesic.mathdoc.fr/item/TAC_2008_21_a6/