I am a lecturer in mathematics at University of Twente in the Netherlands. My research lies in the areas of probability theory, enumerative combinatorics, representation theory on symmetric groups, and analytic number theory. In probability theory and enumerative combinatorics my reseach has evolved around problems related to pattern avoiding permutations, card shuffling problems as well as random labellings on graphs. In analytic number theory my work involves representations of integers by quadratic forms, Theta function identities, determining the number of solutions of quadratic equations, and reciprocity laws for the Legendre symbol.

Interests

- Probability Theory
- Markov Chain Theory
- Combinatorics
- Representation Theory of Symmetric Groups
- Analytic Number Theory

Education

PhD in Mathematics

University of Southern California

MS in Mathematics

Bogazici University

BS in Mathematics

Bogazici University

(2021).

Positive Integers Represented by Regular Primitive Positive-Definite Integral Ternary Quadratic Forms.
In *INTEGERS*.

(2019).
Positive-definite ternary quadratic forms which are (4,1)-universal and (4,3)-universal.
In *INTEGERS*.

(2018).
(2018).
Large deviations for permutations avoiding monotone patterns.
In *The Electronic Journal of Combinatorics*.

(2016).
(2015).
Some new evaluations of the Legendre symbol $\left( \frac{a+b\sqrt{q}}{p}\right)$.
In *Acta Arithmetica*.

(2015).
On the number of representations of a positive integer as a sum of two binary quadratic forms.
In *International Journal of Number Theory*.

(2014).
(2014).
(2013).
Classes taught at University of Twente:

- Calculus 2 for Mechanical Engineers (currently)
- Calculus 1 for Applied Mathematics and Physics Majors
- Discrete Mathematics for Computer Science Majors

Previously taught classes:

- Abstract Algebra I & II
- Differential Equations
- Statistics I & II
- Matrix Algebra
- Discrete Mathematics
- Applied Multivariate and Vector Calculus
- Calculus I & II
- Precalculus I & II

- l.pehlivan@utwente.nl
- Department of Applied Mathematics, University of Twente, Enschede,