We extend the basic concepts of Street's formal theory of monads from the setting of 2-categories to that of double categories. In particular, we introduce the double category Mnd(C) of monads in a double category C and dene what it means for a double category to admit the construction of free monads. Our main theorem shows that, under some mild conditions, a double category that is a framed bicategory admits the construction of free monads if its horizontal 2-category does. We apply this result to obtain double adjunctions which extend the adjunction between graphs and categories and the adjunction between polynomial endofunctors and polynomial monads.
English
510 - Fundamental and general considerations of mathematics
Categories (Matemàtica); Demostració, Teoria de la
37
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Centre de Recerca Matemàtica
Prepublicacions del Centre de Recerca Matemàtica; 951
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