Since 2023, I have been a postdoctoral researcher in mathematics at the Collège de France under the supervision of Timothy Gowers.
Recently, I was honoured to receive the Prix de la Fondation Hugot du Collège de France.
I am interested in research that combines theories and ideas from various areas of mathematics, especially between combinatorics, analysis, and algebra.
Here is a list of my publications, ordered by their first appearance on arXiv. See also arXiv and Google Scholar.
2025
A note on χ-unbounded classes of geometric graphs - arXiv
Noncommutative properties of 0-hyperbolic graphs - arXiv
with Amaury Freslon and Paul Meunier
Block structures of graphs and quantum isomorphism - arXiv
with Amaury Freslon and Paul Meunier
2024
The bunkbed conjecture remains true when gluing along a vertex - arXiv
with Paul Meunier
2023
Burling graphs as intersection graphs - arXiv
Chi-boundedness, Geometric Graph Theory, and Burling Graphs
Ph.D. dissertation, ENS Lyon, July 2023 - link
2022
Lower bound for constant-size local certification
with Virgina Ardévol Martínez, Marco Caoduro, Laurent Feuilloley, Jonathan Narboni, and Jean-Florent Raymond
Journal of Theoretical Computer Science - arXiv, doi (conference version doi)
2021
Burling graphs revisited, part III: applications to χ-boundedness
with Nicolas Trotignon
European Journal of Combinatorics - arXiv, doi
Burling graphs revisited, part II: structure
with Nicolas Trotignon
European Journal of Combinatorics - arXiv, doi
Burling graphs revisited, part I: new characterizations
with Nicolas Trotignon
European Journal of Combinatorics - arXiv, doi
2020
Burling Graphs Revisited
Master 2 thesis, ENS Lyon, June 2020 - link
2018
Combinatorial Curvature of Graphs
M.Sc. Thesis, Sharif University of Technology, October 2018 - link (in Persian)
For my teaching materials, check this page.
Linear Algebra II, TA, École Polytechnique, Fall 2025
Lebesgue integral in Rn, TA, Sorbonne University, Spring 2025
Logic, TA, ENS Lyon, Spring 2023
Probabilities, TA, ENS Lyon, Spring 2023
Optimization and Approximation, TA, ENS Lyon, Fall 2021
Introduction to Computer Science for Complex Systems, TA, ENS Lyon, Fall 2021
Advanced Algorithms, TA, ENS Lyon, Spring 2021
Optimization and Approximation, TA, ENS Lyon, Fall 2020
Discrete Mathematics, TA, Sharif University of Technology, Fall 2016
Mathematical Analysis, TA, Isfahan University of Technology, Spring 2016
Elements of Algebra, TA, Isfahan University of Technology, Spring 2016
Elements of Mathematics, TA, Isfahan University of Technology, Spring 2016
Email: pegah.pournajafi [at] college-de-france [dot] fr
pegah.pournajafi [at] alumni.ens-lyon [dot] fr
Office: Collège de France, 3 Rue d'Ulm, 75005 Paris - Office 117
2020 - 2023
Ph.D. in Mathematics and Computer Science
École Normale Supérieure de Lyon, LIP, Lyon, France
Supervisor: Nicolas Trotignon
2019 - 2020
Master 2 in Fundamental Computer Science
École Normale Supérieure de Lyon, Lyon, France
2016 - 2018
M.Sc. in Pure Mathematics
Sharif University of Technology, Tehran, Iran
2012 - 2016
B.Sc. in Mathematics
Isfahan University of Technology, Isfahan, Iran