Journal
JOURNAL OF ALGEBRA
Volume 608, Issue -, Pages 487-552Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jalgebra.2022.06.004
Keywords
Milnor K-groups; Class field theory
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Funding
- Universitat Regensburg [SFB 1085]
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We introduce an etale fundamental group with modulus and construct a reciprocity homomorphism from the Kato-Saito idele class group with modulus, serving as a K-theoretic analogue of the reciprocity for the cycle-theoretic idele class group with modulus. It plays a central role in demonstrating the isomorphism between the two idele class groups and proving Bloch's formula for the Chow group of 0-cycles with modulus.
We introduce an etale fundamental group with modulus and construct a reciprocity homomorphism from the Kato-Saito idele class group with modulus to this fundamental group. This is the K-theoretic analogue of the reciprocity for the cycle-theoretic idele class group with modulus due to Kerz-Saito. It plays a central role in showing the isomorphism between the two idele class groups and in proving Bloch's formula for the Chow group of 0-cycles with modulus.(c) 2022 Elsevier Inc. All rights reserved.
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