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Homotopy theory, homological algebra, algebraic treatments of manifolds.
2
votes
2
answers
536
views
Reconciling two viewpoints for spectra
As a novice in algebraic topology, I'm trying to grasp the concept of a spectrum. Let me first sketch two motivations.
One motivation goes like this: for singular cohomology of spaces, we have $H^n(X …
2
votes
1
answer
225
views
Cofiber sequence $A\vee A \to A \wedge A \to \bar{A}\wedge \bar{A}$ for a spectrum $A$
For concreteness, let us work with the language of spectra introduced in EKMM.
In Strickland's paper "Products on $MU$-modules", he proves the following. If $R$ is a q-cofibrant commutative $S$-algeb …
30
votes
1
answer
3k
views
What is, really, the stable homotopy category?
When you try to understand the fuss behind the new good categories of spectra that arose on the 90's, you read things such as the following paragraph written by Peter May (from "The Hare and the Torto …
9
votes
0
answers
632
views
Are Bökstedt's THH manuscripts available?
In many papers dealing with topological Hochschild homology, the original unpublished manuscripts by Bökstedt are cited. To name one example, in McClure and Staffeldt's On the topological Hochschild h …
10
votes
1
answer
663
views
Spectra as functors from Spaces to Spaces
I will use the notation of this question. So, if $X$ is a (nice) topological space and $G$ is an abelian group, we can form its $G$-linearization $G[X]$. In McCord's article, this was denoted $B(G,X)$ …
23
votes
3
answers
2k
views
A homology theory which satisfies Milnor's additivity axiom but not the direct limit axiom?
Let us agree on the following: a "homology theory" means a functor $h_*$ from the category of pointed CW complexes to the category of graded abelian groups, together with natural isomorphisms $h_{*+1} …
15
votes
4
answers
4k
views
What does it mean to speak of a homotopy fibration sequence?
I'm reading a paper in which the following is done. We have a certain particular map of spaces $f:X\to Y$ and then it is said something along the lines of "let $Z_f$ denote the space whose defining at …
11
votes
1
answer
842
views
Is the natural isomorphism $|FX_\bullet| \cong F|X_\bullet|$ lax symmetric monoidal?
Let $\mathcal{V_1}$ and $\mathcal{V_2}$ be cocomplete symmetric monoidal categories, each endowed with a cosimplicial object $\Delta^\bullet=\Delta^\bullet_{\mathcal{V}_i}:\Delta \to \mathcal{V}_i$. D …
9
votes
1
answer
511
views
Are cofibrant commutative S-algebras flat?
Let $R$ be a cofibrant commutative $S$-algebra (in the sense of Elmendorf-Kriz-Mandell-May; they call them "$q$-cofibrant") and $A$ be a cofibrant commutative $R$-algebra.
Does $A\wedge_R-:RMod→RM …