COURSE UNIT TITLE

: GALOIS THEORY

DEGREE PROGRAMMES

Description of Individual Course Units

Course Unit Code Course Unit Title Type Of Course D U L ECTS
MAT 4045 GALOIS THEORY ELECTIVE 4 0 0 7

Offered By

Mathematics (English)

Level of Course Unit

First Cycle Programmes (Bachelor's Degree)

Course Coordinator

ASSOCIATE PROFESSOR SALAHATTIN ÖZDEMIR

Offered to

Mathematics (Evening)
Mathematics (English)

Course Objective

The classical algebra problem is to find a "formula'' for the roots of polynomial equations; by a formula, we mean a formula in terms of the coefficients of the polynomial obtained by just using addition, subtraction, multiplication, division and taking powers or roots (to any degree). Whether this is possible for any polynomial is the question that lead to Galois theory. Starting with this motivating problem, the aim is to develop all the necessary algebraic objects (groups and rings, polynomial rings, fields, field extensions) and their properties whenever needed on the way to solve that classical problem in field theory.

Learning Outcomes of the Course Unit

1   Will be able to formulate the precise meaning of the solvability problem of polynomial equations by radicals.
2   Will be able to distinguish normal and separable extensions of fields.
3   Will be able to use The Fundamental Theorem of Galois Theory to observe the correspondence between intermediate field extensions and subgroups of the Galois group.
4   Will be able to express the solvability of a polynomial equation by radicals using the solvability of its Galois group.
5   Will be able to apply Galois Theory to impossibility proofs of some geometric constructions.

Mode of Delivery

Face -to- Face

Prerequisites and Co-requisites

None

Recomended Optional Programme Components

None

Course Contents

Week Subject Description
1 Cubic and quartic equations. Cardan's Formulas.
2 Symmetric polynomials. Discriminant.
3 Roots of polynomials. The Fundamental Theorem of Algebra.
4 Extension fields. Minimal polynomials. Adjoining elements.
5 Degree of a field extension. Finite extensions. The tower theorem. Algebraic extensions. Simple extensions.
6 Splitting fields, their uniqueness up to isomorphism. Normal extensions.
7 Separable extensions. Fields of characteristic 0 and fields of characteristic p. The Primitive Element Theorem.
8 Problem solving.
9 Galois group. Galois group of splitting fields.
10 Permutation of the roots.
11 Abelian equations. Galois extensions. The Fundamental Theorem of Galois Theory.
12 Solvability by radicals. Solvable groups.
13 Cyclotomic extensions. Regular polygons and roots of unity. Impossibility of some geometric constructions using just straightedge and compass.
14 Finite fields.

Recomended or Required Reading

Textbook(s): Redfield, R. H. Abstract Algebra, A Concrete Introduction, Pearson, 2001.

Supplementary Book(s):
1) Cox, David A. Galois Theory, Wiley-Interscience, 2004.
2) Stewart, I. Galois Theory, Third edition, Chapman & Hall/CRC, 2003.

References:
1) Edwards, H. M. Galois Theory, Springer, 1984.
2) Rotman, J. Galois theory, Second Edition, Springer, 1998.
3) Tignol, J. Galois' theory of algebraic equations, World Scientific, 2001.
4) David S. Dummit & Richard M. Foote, Abstract Algebra, Third Edition, Wiley, 2004.

Materials: Instructor s notes and presentations

Planned Learning Activities and Teaching Methods

Lecture Notes, Presentations, Problem Solving, Discussion and Exams

Assessment Methods

SORTING NUMBER SHORT CODE LONG CODE FORMULA
1 VZ Vize
2 FN Final
3 BNS BNS VZ * 0.40 + FN * 0.60
4 BUT Bütünleme Notu
5 BBN Bütünleme Sonu Başarı Notu VZ * 0.40 + BUT * 0.60


Further Notes About Assessment Methods

None

Assessment Criteria

The passing grade will be evaluated as 40% midterm exam and 60% final exam. Class participation is important.

Language of Instruction

English

Course Policies and Rules

To be announced.

Contact Details for the Lecturer(s)

e-mail: salahattin.ozdemir@deu.edu.tr
Phone: (232) 301 8608
Office: B 351/1

Office Hours

To be announced.

Work Placement(s)

None

Workload Calculation

Activities Number Time (hours) Total Work Load (hours)
Lectures 14 4 56
Preparations before/after weekly lectures 14 4 56
Preparation for midterm exam 1 20 20
Preparation for final exam 1 40 40
Final 1 2 2
Midterm 1 2 2
TOTAL WORKLOAD (hours) 176

Contribution of Learning Outcomes to Programme Outcomes

PO/LOPO.1PO.2PO.3PO.4PO.5PO.6PO.7PO.8PO.9PO.10PO.11PO.12PO.13
LO.153533
LO.253533
LO.353533
LO.453533
LO.553533

CONTACT INFORMATION
Dokuz Eylül Üniversitesi Cumhuriyet Bulvarı No: 144 35210 Alsancak / İZMİR
Phone: +90(232) 412 12 12 - Fax: +90 (232) 464 81 35

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