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Jan
17
answered Genuine equivariant ambidexterity
Dec
7
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25
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14
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30
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17
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Sep
16
asked Morava $K$-theory of $K( \mathbb{Z}/p^2)$
Sep
7
answered Schematization of a topological space
Jul
23
comment Milnor descent for ring spectra
If you are looking for the case (which I think is relevant for "Milnor descent") of a derived version of a pushout along closed immersions, there is a positive result with connectivity hypotheses in Theorem 7.2 of DAG IX, as well as a counterexample if these are omitted (Warning 7.3). As I think is implicit in your post, the functor $F$ is automatically fully faithful, so the question is equivalent to essential surjectivity of $F$ (or conservativity of $R$).
Jul
7
comment Intersections of ideals and nilpotence
@user26857: The former. I've edited to clarify this point.
Jul
7
revised Intersections of ideals and nilpotence
added 19 characters in body
Jul
7
asked Intersections of ideals and nilpotence
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May
23
answered Compact objects in undercategories and filtered colimits
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Mar
16
asked Decomposition of symmetric powers of reduced regular representation modulo $p$