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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 …
Bruno Stonek's user avatar
  • 3,004
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 …
Bruno Stonek's user avatar
  • 3,004
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 …
Bruno Stonek's user avatar
  • 3,004
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In many papers dealing with topological Hochschild homology, the original unpublished manuscripts by Bökstedt are cited.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 …
Bruno Stonek's user avatar
  • 3,004
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 $B(G,X)$ …
Bruno Stonek's user avatar
  • 3,004
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} …
Bruno Stonek's user avatar
  • 3,004
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 …
Bruno Stonek's user avatar
  • 3,004
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 …
Bruno Stonek's user avatar
  • 3,004
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 …
Bruno Stonek's user avatar
  • 3,004