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Drew Heard's user avatar
Drew Heard's user avatar
Drew Heard's user avatar
Drew Heard
  • Member for 13 years, 4 months
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Why did Ravenel define a ring spectrum to be flat if its smash-square splits into copies of itself?
Lazard's theorem for connective modules over connective ring spectra is equivalent to Definition (2) (Theorem 7.2.2.15 of Higher Algebra)
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Instances of "correcting" the compact objects of a category?
Another example worth spelling out (I guess it is a special case of (2)): the derived category of comodules often has the dualizable comodules failing to be compact. Fixing this gets you (more or less) Hovey's stable comodule category (arxiv.org/abs/math/0301229)
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Projective $BP_\ast$-dimension of the $BP$-homology of classifying spaces of finite groups
Very much related to the previous two comments - I would try seeing if you could get something out of arxiv.org/pdf/1507.06867.pdf (which doesn't consider BP, but does consider MU).
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How to construct a morphism $f_*\hom(X,f^!Y)\to \hom(f_!X,Y)$
(I got my adjunctions the wrong way around in the previous comment, I meant a case where $f_!$ is not right adjoint to $f_*$)
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How to construct a morphism $f_*\hom(X,f^!Y)\to \hom(f_!X,Y)$
@Gabriel In any case, if you are not aware of it (although you probably are) the paper by Balmer--Dell'Ambrogio--Sanders should be of interest (arxiv.org/pdf/1501.01999.pdf) - Equation 3.7 is what you want, although they are working under stronger conditions than what you want. But maybe you can find something useful in there anyway.
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How to construct a morphism $f_*\hom(X,f^!Y)\to \hom(f_!X,Y)$
Do you know an example where $f^!$ is not just right adjoint to $f_*$?
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