Contents
Context
Homological algebra
Higher algebra
Contents
1. Idea
A spectral sequence is called multiplicative or a spectral ring if there is a bi-graded algebra structure on each page such that the differentials act as graded derivations of total degree 1.
For example the Serre-Atiyah-Hirzebruch spectral sequence with coefficients in a ring spectrum.
2. Constructions
From spectral products on Cartan-Eilenberg systems
The following gives sufficient conditions for a Cartan-Eilenberg spectral sequence to be multiplicative. This is due to (Douady 58). The following is taken from (Goette 15a).
Definition 2.1. Let , und be Cartan-Eilenberg systems. A spectral product is a sequence of homomorphisms
such that for all , , , the following two diagrams commute:
and
Write for the Cartan-Eilenberg spectral sequence induced from the Cartan-Eilenberg system .
Proposition 2.3. A spectral product as in def. 2.1 induces products
such that
-
-
,
-
is induced by .
(Goette 15a, following Douady 58, theorem II).
Proof. Assume by induction that is induced by . In particular,
This is clear for if we put because and .
Let , be represented by , with , . Using the first diagram and the construction of , we conclude that
From the second diagram, we get
This proves the Leibniz rule (2).
From the Leibniz rule and the facts that and , we conclude that induces a product on , which proves (3). Because is induced by , so is , and we can continue the induction. ▮
3. Examples
We discuss that the multiplicative structure on the cohomology Serre-Atiyah-Hirzebruch spectral sequence for multiplicative generalized cohomology. This is taken from (Goette 15b).
Definition 3.2. The spectral product , def. 2.1, on the Cartan-Eilenberg system of def. 3.1 is that given by the following morphism
Together with the diagonal map , for , we define
Proposition 3.3. With def. 3.2, then for all , , , the following [[commuting diagram|diagram commutes]]
Hence by prop. 2.3 the spectral product of def. 3.2 defines a mutliplicative structure on the Serre-WhiteheadAtiyah-Hirzebruch spectral sequence for multiplicative generalizted cohomology.
Proof. The upper square commutes because the maps are [[natural transformations]]. For the lower square, we consider the boundary morphism of the triple
The following diagram commutes:
By extend this diagram to the right using the maps once concludes that the lower square above also commutes. ▮
- [[multiplicative cohomology theory]]
5. References
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[[Adrien Douady]], La suite spectrale d’Adams : structure multiplicative Séminaire Henri Cartan, 11 no. 2 (1958-1959), Exp. No. 19, 13 p (Numdam)
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Brayton Gray, Products in the Atiyah-Hirzebruch spectral sequence and the calculation of , Trans. Amer. Math. Soc. 260 (1980), 475-483 (web)
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[[Stanley Kochmann]], prop. 4.2.9 of [[Bordism, Stable Homotopy and Adams Spectral Sequences]], AMS 1996
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[[John McCleary]], section 2.3 in A User’s Guide to Spectral Sequences, Cambridge University Press (2000)
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[[Daniel Dugger]], Multiplicative structures on homotopy spectral sequences I (arXiv:math/0305173)
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[[Daniel Dugger]], Multiplicative structures on homotopy spectral sequences II (arXiv:math/0305187)
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[[Sebastian Goette]], MO comment a, MO comment b Feb 15, 2015
[[!redirects multiplicative spectral sequences]]