Beyond Initial Algebras and Final Coalgebras

Published 3 Mar 2023 in math.CT and cs.LO | (2303.02065v1)

Abstract: We provide a construction of the fixed points of functors which may not be inital algebras or final coalgebras. For an endofunctor F, this fixed point construction may be expressed as a pair of adjoint functors between F-coalgebras and F-algebras. We prove a version of the limit colimit coincidence theorem for these generalized fixed points.

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