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12 votes
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Eilenberg–Moore algebras in terms of Kleisli ones

One nice result is Street's theorem 14 in The formal theory of monads, generalized in Elementary cosmoi, which says that $C^T$ is isomorphic to the full subcategory of $[(C_T)^{\mathrm{op}}, \mathrm{Set … Maybe try Kelly & Power, Adjunctions whose counits are coequalizers, and presentations of finitary enriched monads, JPAA 89 (1993). …
Finn Lawler's user avatar
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15 votes
Accepted

Any example of a non-strong monad?

Here is a class of examples different to Tom's: if your underlying monoidal category C is closed, then a strong monad on C is the same as a C-enriched monad, i.e. one that respects the enrichment of C …
Finn Lawler's user avatar
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8 votes
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Monad arising from operad

The answer is no, and it is explained in Appendix C of Leinster's book Higher Operads, Higher Categories. Briefly, a 'plain operad', for Leinster, is a non-symmetric operad in Set; a T-operad for T t …
Finn Lawler's user avatar
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7 votes

Relation between monads, operads and algebraic theories

Apart from Todd's recommendations, which I'd second, for monads and Lawvere theories there is Nishizawa and Power, Lawvere theories enriched over a general base, JPAA 213, 2009, and the references therein …
Finn Lawler's user avatar
  • 3,622