f-cohomology

General Introduction

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Search results

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Online References

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Paper References

Greenlees and May: Generalized Tate cohomology (book)

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Definition

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Properties

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Standard theorems

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Open Problems

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Connections to Number Theory

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Computations and Examples

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History and Applications

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Some Research Articles

arXiv:1003.1219 f-cohomology and motives over number rings from arXiv Front: math.AG by Jakob Scholbach This paper is concerned with an interpretation of f-cohomology, a modification of motivic cohomology of motives over number fields, in terms of motives over number rings. Under standard assumptions on mixed motives over finite fields, number fields and number rings, we show that the two extant definitions of f-cohomology of mixed motives $M\eta$ over F--one via ramification conditions on $\ell$-adic realizations, another one via the K-theory of proper regular models--both agree with motivic cohomology of $\eta{!} M\eta[1]$. Here $\eta{!}$ is constructed by a limiting process in terms of intermediate extension functors $j_{!*}$ defined in analogy to perverse sheaves.

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General Introduction