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Theories of analytic monads

Published online by Cambridge University Press:  11 March 2014

STANISŁAW SZAWIEL  and
MAREK ZAWADOWSKI
STANISŁAW SZAWIEL
Affiliation:
Institute of Mathematics, University of Warsaw, S. Banacha 2, 02-097 Warszawa, Poland Email: [email protected]; [email protected]
MAREK ZAWADOWSKI
Affiliation:
Institute of Mathematics, University of Warsaw, S. Banacha 2, 02-097 Warszawa, Poland Email: [email protected]; [email protected]
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Abstract

In this paper we characterise the categories of Lawvere theories and equational theories that correspond to the categories of analytic and polynomial monads on Set, and hence also to the categories of the symmetric and rigid operads in Set. We show that the category of analytic monads is equivalent to the category of regular-linear theories. The category of polynomial monads is equivalent to the category of rigid theories, that is, regular-linear theories satisfying an additional global condition. This solves a problem posed by A. Carboni and P. T. Johnstone. The Lawvere theories corresponding to these monads are identified via some factorisation systems. We also show that the categories of analytic monads and finitary endofunctors on Set are monadic over the category of analytic functors. The corresponding monad for analytic monads distributes over the monad for finitary endofunctors and hence the category of (finitary) monads on Set is monadic over the category of analytic functors. This extends a result of M. Barr.

Type
Paper
Information
Mathematical Structures in Computer Science , Volume 24 , Issue 6 , December 2014 , e240604
Copyright
Copyright © Cambridge University Press 2014 

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