Skew Monoidal Monoids

Coherence for Skew-Monoidal Categories

We motivate a variation (due to K. Szlachányi) of monoidal categories called skew-monoidal categories where the unital and associativity laws are not required to be isomorphisms, only natural transformations. Coherence has to be formulated differently than in the well-known monoidal case. In my (to my knowledge new) version it becomes a statement of uniqueness of normalizing rewrites. We presen...

Weak Hopf Monoids in Braided Monoidal Categories

We develop the theory of weak bimonoids in braided monoidal categories and show them to be quantum categories in a certain sense. Weak Hopf monoids are shown to be quantum groupoids. Each separable Frobenius monoid R leads to a weak Hopf monoid R ⊗ R.

Cohomology of Monoids in Monoidal Categories

On Solid and Rigid Monoids in Monoidal Categories

We introduce the notion of solid monoid and rigid monoid in monoidal categories and study the formal properties of these objects in this framework. We show that there is a one to one correspondence between solid monoids, smashing localizations and mapping colocalizations, and prove that rigid monoids appear as localizations of the unit of the monoidal structure. As an application, we study soli...

Zero Loci of Skew-growth Functions for Dual Artin Monoids

We show that the skew-growth function of a dual Artin monoid of finite type P has exactly rank(P ) =: l simple real zeros on the interval (0, 1]. The proofs for types Al and Bl are based on an unexpected fact that the skewgrowth functions, up to a trivial factor, are expressed by Jacobi polynomials due to a Rodrigues type formula in the theory of orthogonal polynomials. The skew-growth function...