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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
Ramification Groups of Local Fields: With Geometric Applications

Ramification Groups of Local Fields: With Geometric Applications

Saito, Takeshi

Hardcover

Series: New Mathematical Monographs, Book 53

General Mathematics

ISBN10: 1009617532
ISBN13: 9781009617536
Publisher: Cambridge University Press
Published: Jun 18 2026
Pages: 474
Weight: 1.76
Height: 1.06 Width: 6.00 Depth: 9.00
Language: English
Ramification groups of local fields are essential tools for studying boundary behaviour in geometric objects and the degeneration of Galois representations. This book presents a comprehensive development of the recently established theory of upper ramification groups of local fields with imperfect residue fields, starting from the foundations. It also revisits classical theory, including the Hasse-Arf theorem, and offers an optimal generalisation via log monogenic extensions. The conductor of Galois representations, defined through ramification groups, has numerous geometric applications, notably the celebrated Grothendieck-Ogg-Shafarevich formula. A new proof of the Deligne-Kato formula is also provided; this result plays a pivotal role in the theory of characteristic cycles. With a foundational understanding of commutative rings and Galois theory, graduate students and researchers will be well-equipped to engage with this rich area of arithmetic geometry.

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