CODE  106978 

ACADEMIC YEAR  2022/2023 
CREDITS 

SCIENTIFIC DISCIPLINARY SECTOR  MAT/02 
TEACHING LOCATION 

SEMESTER  1° Semester 
MODULES  This unit is a module of: 
TEACHING MATERIALS  AULAWEB 
This course presents the foundations of field theory and Galois theory, a mathematical theory developed at the beginning of the nineteenth century to study the solvability of algebraic equations.
Motivated by classic problems such as the search for a formula for the solutions of fifth degree equations or the construction with ruler and compass of a regular polygon with 7 sides, we will show how to attach a group of permutations to a field extension. This establishes a very deep correspondence between groups and fields, which provides a dictionary for transporting concepts and properties from field theory to group theory and vice versa.
In this way we will be able to translate field theory questionss such as the problem of finding solutios of fifth degree equations into a group theory problem such as the existence of certain subgroups of S_5, and settle it in the world of groups.
o provide an indepth knowledge of field extensions and of Galois theory, in particular to deepen some applications of cyclotomic fields and radical solvability of algebraic equations.
The purpose of the course is to:
At the end of the course, the student will be able to:
The definition of field. Complex numbers. Basic notions of algebra, including: Gauß's lemma; Eisenstein criterion; group actions.
Traditional teaching, if the pandemic allows.
Students with SLD, disability or other special educational needs certification are advised to contact the teacher at the beginning of the course to agree on teaching and exam methods that, in compliance with the teaching objectives, take into account the modalities learning opportunities and provide suitable compensatory tools.
Field extensions and their basic properties.
Algebraic closure of a field: existence and uniqueness. Kronecker construction.
Normal splitting fields and extensions.
Separable, inseparable and purely inseparable extensions. Primitive element theorem.
Galois Extensions. Galois group and Galois correspondence for finite extensions.
Profinite groups and Krull topology. Galois correspondence for infinite extensions.
Galois group of an equation. Cyclotomic extensions. Generic equation of degree n.
Linear independence of characters. Trace and norm. Hilbert's Theorem 90. Hints of group cohomology. Cyclical extensions and Kummer theory.
Solvable groups. Solvable extension andradical extensions.
Further examples and applications.
Algebra S. Bosch
Algebra S. Lang
Algebra M. Artin
Class Field Theory J. Neukirch
Office hours: See Aulaweb
ALESSANDRO DE STEFANI (President)
ALESSIO CAMINATA
RICCARDO CAMERLO (President Substitute)
ALDO CONCA (President Substitute)
EMANUELA DE NEGRI (President Substitute)
STEFANO VIGNI (President Substitute)
ANNA MARIA BIGATTI (Substitute)
GIUSEPPE ROSOLINI (Substitute)
FRANCESCO VENEZIANO (Substitute)
According to the schedule of the Corso di Studi
All class schedules are posted on the EasyAcademy portal.
If the pandemic situation allows it, the exam will consist of a written and an oral part. Passing the written test will allow admission to the oral test within the same exam session.
The written test will consist of problems to assess the ability to
The oral exam will focus on the content of the lectures and will also take into account the clarity of presentation and the accurate use of scientific terminology.
More/more current informations on Aulabew