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Drew Heard's user avatar
Drew Heard
  • Member for 13 years, 4 months
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On the comparison map $MU^\bullet(X)\otimes_{MU^\bullet(pt)}E^\bullet(pt)\to E^\bullet(X)$ for complex oriented multiplicative cohomology theories
One example of a complex oriented cohomology theory that is not Landweber exact is $H\mathbb{Z}$.
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localizing subcategories of a nice triangulated category
@FernandoMuro For $Y,\{X_i\} \in \text{Loc}(b)$ we have $[Y,W \prod_i {X_i}] = [i(Y),\prod {X_i}] = \prod_i [i(Y),X_i] = \prod_i [Y,W(X_i)]$. So I think the product is just the product in $D(A)$ followed by $W$.
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localizing subcategories of a nice triangulated category
Is there any reason to suspect this is true? Take $A = D(R)$ for, say, a Noetherian regular local ring $(R,\mathfrak{m},k)$, and take $b = k$. The localizing subcategory generated by $k$ is then the derived category $\mathfrak{m}$-torsion $R$-modules. The inclusion will not, in general, preserve limits.
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Bigraded endomorphisms of the motivic sphere over a field
OK, the latter is the same as arxiv.org/pdf/1811.05729.pdf, and is also coauthored by Isaksen.
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Bigraded endomorphisms of the motivic sphere over a field
$\pi_{1,0}\mathbb{1}$ (I always get confused by motivic grading) is computed in arxiv.org/pdf/1604.00365.pdf. For an expository article, perhaps: Østvær, Paul Arne (2020). Motivic stable homotopy groups, In Haynes Miller (ed.), Handbook of Homotopy Theory. Chapman & Hall/CRC. ISBN 9780815369707. Motivic stable homotopy groups. s 759 - 793
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The derived $\infty$-category of sheaves on a site is closed symmetric monoidal
In addition, the appendix to "On topological cyclic homology", in particular Theorem A.7 has the statement you want as well.
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$p$-completeness of the function spectrum $F(\Sigma^{\infty} BS, \Sigma^{\infty} BK)$
Ragnarsson's paper links to 'Classifying G-spaces and the Segal conjecture' - did you check there?
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When is the natural map of Tate cohomology an isomorphism?
It holds, for example, if A is a projective Z[G]-module (III.1.1(c) in Brown's book 'Cohomology of Groups')
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Is algebraic $K$-theory a motivic spectrum?
@MarcHoyois Is it true that Cisinski proves this for a general qcqs scheme? My French isn't very good, but it seems like it is shown for Noetherian schemes of finite Krull dimension ('ans ce qui suit, tous les schémas seront noethériens, de dimension de Krull finie.')
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Is $\mathbb{Z}_p \otimes_{\mathbb{Z}} \mathbb{Z}_p$ coherent?
Dear Badam, I'm not sure, but it seems to be difficult/unknown. There is a paper of Auslander which considers the case of global dimension of algebras over a field, but this is as much as a I could find.
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