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Subject: Combining monads
Date: Wed, 14 Jan 1998 15:10:01 -0400 (AST)
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Date: Wed, 14 Jan 1998 16:21:51 +0000 (GMT)
From: Tom Leinster <T.Leinster@dpmms.cam.ac.uk>


Is the pullback of a monadic functor along a monadic functor
necessarily monadic?
Is the diagonal of the pullback square monadic?
Does this work if your restrict yourself to, say, finitary monadic
functors?

(E.g. it works for finitary monads on Set: the theory of sets with
both ring and lattice structure (not interacting in any particular
way) comes from a monad.)

Thanks,
Tom Leinster