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Dec 3 at 20:48 history closed Peter LeFanu Lumsdaine
Daniele Tampieri
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Duplicate of The change-of-monoid adjunction between categories of modules induced by a morphism of monoids
Dec 3 at 20:45 vote accept ari rosenfield
Dec 3 at 10:21 history became hot network question
Dec 3 at 9:24 comment added Vladimir Dotsenko It is certainly mentioned matter-of-factly as completely well known in "Coequalizers in categories of algebras" of Linton (link.springer.com/chapter/10.1007/BFb0083082). One may argue that this is already in "Functorial semantics of algebraic theories" of Lawvere (pnas.org/doi/abs/10.1073/pnas.50.5.869), though of course there it is mentioned (as obvious) for equational algebraic theories only.
S Dec 3 at 9:02 history suggested J. W. Tanner
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Dec 3 at 8:29 answer added varkor timeline score: 6
Dec 3 at 8:13 review Close votes
Dec 3 at 20:57
Dec 3 at 7:57 comment added Peter LeFanu Lumsdaine This was asked last year under different terminology: The change-of-monoid adjunction between categories of modules induced by a morphism of monoids. (Though if you just want the monad case, that’s a bit more specific and might be out there somewhere else.)
Dec 3 at 4:45 comment added Qiaochu Yuan That phrasing is a little ambiguous; it seems clearer to say that pullback along $\phi$ defines a functor from $T$-algebras to $S$-algebras, etc. Even in familiar examples there may be more than one candidate for $\phi$, e.g. there are two homomorphisms from the monoid monad to the ring monad, corresponding to addition and multiplication.
Dec 3 at 4:39 review Suggested edits
S Dec 3 at 9:02
Dec 3 at 1:46 history asked ari rosenfield CC BY-SA 4.0