219 research outputs found
Multiplicative structures on homotopy spectral sequences I
This mostly expository paper records some basic facts about towers of
homotopy fiber sequences. We give a proof that a pairing of towers induces a
pairing of associated spectral sequences, for towers of spaces and towers of
spectra
Combinatorial model categories have presentations
We show that every combinatorial model category can be obtained, up to
Quillen equivalence, by localizing a model category of diagrams of simplicial
sets. This says that any combinatorial model category can be built up from a
category of `generators' and a set of `relations'---that is, any combinatorial
model category has a presentation
Universal homotopy theories
Given a small category C, we show that there is a universal way of expanding
C into a model category, essentially by formally adjoining homotopy colimits.
The technique of localization becomes a method for imposing `relations' into
these universal gadgets. The paper develops this formalism and discusses
various applications, for instance to the study of homotopy colimits, the
Dwyer-Kan theory of framings, and to the homotopy theory of schemes
A curious example of two model categories and some associated differential graded algebras
The paper gives a new proof that the model categories of stable modules for
the rings Z/(p^2) and (Z/p)[\epsilon]/(\epsilon^2) are not Quillen equivalent.
The proof uses homotopy endomorphism ring spectra. Our considerations lead to
an example of two differential graded algebras which are derived equivalent but
whose associated model categories of modules are not Quillen equivalent. As a
bonus, we also obtain derived equivalent dgas with non-isomorphic K-theories
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