We study connections between additive and abelian 2-representations of fiat 2-categories, describe combinatories of 2-categories in terms of multisemigroups and determine the annihilator of a cell 2-representation. We also describe, in detail, examples of fiat 2-categories associated to sl(2)-categorification in the sense of Chuang and Rouquier, and 2-categorical analogues of Schur algebras.
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Case Western Reserve Univ, Dept Math Appl Math & Stat, Cleveland, OH 44106 USACase Western Reserve Univ, Dept Math Appl Math & Stat, Cleveland, OH 44106 USA
Gurski, Nick
Johnson, Niles
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Ohio State Univ Newark, Dept Math, Newark, OH USACase Western Reserve Univ, Dept Math Appl Math & Stat, Cleveland, OH 44106 USA
Johnson, Niles
Osorno, Angelica M.
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Reed Coll, Dept Math, Portland, OR 97202 USACase Western Reserve Univ, Dept Math Appl Math & Stat, Cleveland, OH 44106 USA