On semiflexible, flexible and pie algebras

Details On semiflexible, flexible and pie algebras On semiflexible, flexible and pie algebras

2011-12-06

arxiv.org/abs/1112.1448v1

Mathematics

Category Theory

48 pages

Scientific paper

We introduce the notion of pie algebra for a 2-monad, these bearing the same relationship to the flexible and semiflexible algebras as pie limits do to flexible and semiflexible ones. We see that in many cases, the pie algebras are precisely those "free at the level of objects" in a suitable sense; so that, for instance, a strict monoidal category is pie just when its underlying monoid of objects is free. Pie algebras are contrasted with flexible and semiflexible algebras via a series of characterisations of each class; particular attention is paid to the case of pie, flexible and semiflexible weights, these being characterised in terms of the behaviour of the corresponding weighted limit functors.

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