Math 105

Algebraic Number Theory
Last updated June 18, 2019 10:16:10 EDT

Syllabus


Week           Brief Description
3/25-3/29 The ring of integers of an algebraic number field is a Dedekind domain (integral extensions, fractional ideals, unique factorization of ideals); weak approximation.
4/1-4/5 Valuations and the places of a number field; completions of number fields wrt valuations; valuation rings; arithmetic in local fields.
4/8-4/12 Completions of number fields at non archimedean places are locally compact, totally disconnected topological fields; the places of a number field are inequivalent; Ostrowski's theorem; restricted direct products; adeles and topological considerations.
4/15-4/19 Haar measure on locally compact abelian groups; modulus; product formula for valuations; ideles; Fujisaki's lemma; finiteness of the class number.
4/22-4/26 Dirichlet unit theorem; strong approximation; local fields; Hensel's lemma.
4/29-5/3 Local fields; uniqueness of valutions; arithmetic of local fields, ramification.
5/6-5/10 Unramified extensions; ramified extensions, inertial field; different, discrimiant, and ramification.
5/13-5/17 Tame and wild ramification; Galois extensions of local fields;
5/20-5/24 Global fields; splitting of primes; Dedekind-Kummer, Global ramification theory; local-global computations; Galois considerations,; decompostion groups; Frobenius automorphism.
5/29 42 (as in the answer to $\dots$)