*Instructor:* Dr. Antal BALOG

*Text: *Classnotes by the lecturer based on selected chapters of
Harold Davenport, Multiplicative Number Theory.

*Prerequisite:* General mathematical experience of the undergraduate
level is expected. This includes elementary algebra (Abelian groups, vector
spaces, systems of linear equations) and calculus (limits, derivatives,
integration, infinite series). A **first course of number theory** (divisibility,
congruences, Chinese Remainder Theorem, primitive roots and power residues)
and a course of **complex function theory** (analytic functions, continuation,
power series, complex line integrals, calculation of residues) are** essential**,
although the basic concepts of the applied theories and theorems will always
be explained. Taking CLX parallel to this course is enough.

*Course description:* Our aim is to provide a classical introduction
to analytic number theory, focused on the connection between the zeros
of the Riemann z*(s)*-function and prime
numbers. We will follow the history and development of a beautiful discipline,
rich in problems, methods and ideas. The highlights are a proof of Dirichlet's
Theorem about the distribution of primes in arithmetic progressions, and
of the Prime Number Theorem, but the course is much more than just the
proof of two famous theorems.

*Topics:*

**Short review.** Basic notions and theorems about divisibility,
primes and congruences, the Legendre symbol and the quadratic reciprocity,
primitive roots and discrete logarithm.

**Arithmetical functions**. Additive and multiplicative functions,
convolution, the Möbius inversion formulas, partial summation,
mean value of some functions, elementary prime number estimates.

**Dirichlet series.** The general theory of Dirichlet series, convergence,
Euler products, Perron's type formulas.

**Dirichlet's theorem.** The prime modulus case, characters, *L*--functions,
the general case, primitive characters and Gaussian sums. (*If time permits:
*quadratic forms, Dirichlet's class number formula.)

**Riemann's memoir.** The z*(s)*-function,
analytic properties of z*(s)* and *L*(s,c),
integral functions of order 1, the G--function,
the zeros of z*(s) *and *L*(s,c),
the Riemann Hypothesis (a XIX* ^{th}* century problem for the
XXI

**Other prime number sums.** (*If time permits: *The Goldbach--Vinogradov
theorem, the Polya--Vinogradov inequality, the large sieve, the Bombieri--Vinogradov
theorem.)