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# DEPARTMENT OF MATHEMATICS

## Algebra Syllabus

### SYLLABUS FOR ALGEBRA, MATH 470

#### 1st QUARTER

##### Category theory I:

Definitions, initial/final objects, (co)products.

##### Groups:

Notions: Definitions, normal subgroups, actions, nilpotent, solvable, simple, extensions, semi-direct product, composition series, presentation, Cayley graphs.

Theorems: Isomorphism theorem, Lagrange, Jordan-Hölder, Sylow.

Examples: $S_n$, $A_n$, $GL(n,p)$, $GL(n R)$, $U_n$, free groups, $p$-groups.

##### Rings and Modules:

Notions: Definitions, ideals, integral domains, prime and maximal ideals, Noetherian rings, complexes, homology, exact sequences.

Theorems: Isomorphism theorem, snake lemma, Hilbert's basis theorem.

Examples: Polynomial rings, power series, $p$-adics.

#### 2nd QUARTER

##### Factorization in rings:

Notions: prime and irreducible elements, PID's, UFD's, Euclidean domains.

Theorems: Polynomial rings over UFD's are UFD's, Chinese Remainder Theorem.

Examples: irreducibilty in polynomial rings, Eisenstein's criterion, Gaussian integers.

##### Linear algebra I:

Notions: bases and dimension, torsion, presentations and resolutions, characteristic polynomials, canonical forms.

Theorems: classification of finitely generated modules over PID's, Cayley-Hamilton, Jordan canonical form.

##### Fields:

Notions: definition, simple extensions, finite and algebraic extensions, algebraic closure, splitting field, normal and separable extensions, Galois extensions, (transcendental extensions in 3rd quarter).

Theorems: existence of algebraic closure, Galois correspondence.

Examples: rational functions, finite fields, cyclotomic fields, applications of Galois theory (e.g. solvability of polynomials).

#### 3rd QUARTER

##### Category theory II:

Notions: Functors, natural transformation, exact functors, adjoint functors, limits, colimits (and filtered colimits), relation with universal properties.

Theorems: Preservation of limits/colimits by adjoint functors.

##### Linear algebra II:

Notions: Tensor product, extension of scalars, symmetric and exterior powers, flat modules, projective modules, injective modules, Tor, Ext.

Theorems: A free module is projective. A projective module is flat. Existence and homotopy uniqueness of projective and injective resolutions of modules.

##### Commutative algebra:

Notions: Localization of rings and modules, integral homomorphism of rings, integral closure, normal domains, spectra of rings and Zariski topology, transcendental field exensions, Krull dimension.

Theorems: Nakayama's Lemma, Going-up and Going-down, Noether normalization, Hilbert and Zariski Nullstellensatz, (transcendence degree equals Krull dimension for finitely generated algebras over a field).

##### Homological algebra:

Notions: Additive category, abelian category, complexes, homotopy category of complexes, derived category, derived functors and cohomology, spectral sequence.

NOTE: At the discretion of the instructor, the Homological Algebra section, and possibly the final topics in the Commutative Algebra section, could be replaced by:

Representation theory of finite groups (char. 0):

Notions: Irreducible representation, group algebra, matrix coefficients, character, induction, Fourier transform, convolution.

Theorems: Maschke, Schur's lemma, Frobenius's reciprocity, orthogonality relations, Plancherel.

Examples: Abelian groups, $S_3$, $(S_4)$.

##### Noncommutative algebra:

Structure of semisimple rings, Jacobson radical, Wedderburn Theorem, division algebras.

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