Remarks on Units of Skew Monoidal Categories

Andrianopoulos, Jim

doi:10.1007/s10485-016-9468-5

Cited by 1 publication

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References 14 publications

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“…Thus, it is important to prove analogs of the coherence theorem for various existing generalizations of categories (having weak modification of units [55,65,66] and from the "periodic table" of higher categories [67]) as well as for further generalizations (e.g., n-ary ones below).…”

Section: P2bqmentioning

confidence: 99%

Graded Medial n-Ary Algebras and Polyadic Tensor Categories

Duplij

2021

Symmetry

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Algebraic structures in which the property of commutativity is substituted by the mediality property are introduced. We consider (associative) graded algebras and instead of almost commutativity (generalized commutativity or ε-commutativity), we introduce almost mediality (“commutativity-to-mediality” ansatz). Higher graded twisted products and “deforming” brackets (being the medial analog of Lie brackets) are defined. Toyoda’s theorem which connects (universal) medial algebras with abelian algebras is proven for the almost medial graded algebras introduced here. In a similar way we generalize tensor categories and braided tensor categories. A polyadic (non-strict) tensor category has an n-ary tensor product as an additional multiplication with n−1 associators of the arity 2n−1 satisfying a n2+1-gon relation, which is a polyadic analog of the pentagon axiom. Polyadic monoidal categories may contain several unit objects, and it is also possible that all objects are units. A new kind of polyadic categories (called groupal) is defined: they are close to monoidal categories but may not contain units: instead the querfunctor and (natural) functorial isomorphisms, the quertors, are considered (by analogy with the querelements in n-ary groups). The arity-nonreducible n-ary braiding is introduced and the equation for it is derived, which for n=2 coincides with the Yang–Baxter equation. Then, analogously to the first part of the paper, we introduce “medialing” instead of braiding and construct “medialed” polyadic tensor categories.

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Section: P2bqmentioning

confidence: 99%

Graded Medial n-Ary Algebras and Polyadic Tensor Categories

Duplij

2021

Symmetry

View full text Add to dashboard Cite

show abstract

Remarks on Units of Skew Monoidal Categories

Cited by 1 publication

References 14 publications

Graded Medial n-Ary Algebras and Polyadic Tensor Categories

Graded Medial n-Ary Algebras and Polyadic Tensor Categories

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