Babes-Bolyai University of Cluj-Napoca
Faculty of Mathematics and Computer Science
Study Cycle: Graduate

SUBJECT

Code
Subject
MML0006 Galois Theory and Universal Algebras
Section
Semester
Hours: C+S+L
Category
Type
Mathematics - in Romanian
6
2+1+0
speciality
optional
Applied Mathematics
6
2+1+0
speciality
optional
Teaching Staff in Charge
Assoc.Prof. PELEA Cosmin Razvan, Ph.D.,  cpeleamath.ubbcluj.ro
Aims
To know some basics on field extensions and finite fields. An introduction to Galois theory. The study of some basic notions and results on universal algebras, applications to the algebraic structures studied in the previous semesters.
Content
Galois Theory. Field extensions. Separable extensions and normal extensions. Algebraically closed fields. Finite fields. Wedderburn@s theorem. Determination of finite fields and of subfields of a finite field. Galois group. The fundamental theorem of Galois Theory. Solvable groups. Characterization of equations solvable by radicals.

Universal algebras. n-ary operations and universal algebras. Homomorphisms. Stable subsets, subalgebras. The lattice of subalgebras, generated subalgebra. Particular cases: generated subsemigroup, generated subgroup, generated subring, generated submodule. Algebraic closure systems and operators. Direct products of universal algebras. Homomorphic relations. Quotient algebraic congruences. The lattice of congruences. The connection between the congruences of a group and its normal subgroups. The connection between the congruences of a ring and its ideals. Factorization of a homomorphism through a surjective or injective homomorphism. The isomorphism theorems for universal algebras and deduction of the isomorphism theorems for groups and rings.
References
1. S. BURRIS, H.P. SANKAPPANAVAR: A course in universal algebra, Springer-Verlag, 1981.
2. G. GRATZER: Universal algebra, Second Edition, Springer-Verlag, 1979.
3. I.D. ION, N. RADU: Algebra. Ed 4. Ed.Didactica si Pedagogica, 1990.
4. I.D. ION, N. RADU, C. NITA, D. POPESCU: Culegere de probleme de algebra, Ed. Didactica si Pedagogica, 1981.
5. S. LANG: Algebra, Addison-Wesley, Reading 1965.
6. C. NASTASESCU, C. NITA: Teoria calitativa a ecuatiilor algebrice, Ed. Tehnica, Bucuresti, 1979.
7. I. PURDEA: Tratat de algebra moderna vol. 2, Ed. Acad., 1982.
8. I. PURDEA, C. PELEA: Probleme de algebra, Ed. EIKON, 2008.
9. I. PURDEA, G. PIC: Tratat de algebra moderna, Vol.I, Ed. Acad., 1977.
10. I. PURDEA, I. POP, Algebra, Editura GIL, Zalau, 2003.

Assessment
Homework. Tests (33% x final grade). Oral exam (67% x final grade).
Links: Syllabus for all subjects
Romanian version for this subject
Rtf format for this subject