Graph Theory Family in Lebanon

We are pleased to share that Dr. Batoul Tarhini has started her postdoctoral research at Gebze Technical University, in a project led by Prof. Didem Gözüpek and supported by the Scientific and Technological Research Council of Türkiye.

Despite years of economic hardship, instability, and war in Lebanon, research at the Lebanese University never stopped, but it's accelerating!
Behind the scenes, our team kept working, kept pushing boundaries, and kept believing.

We proudly share the results: more research, more PhD students, and stronger scientific presence than ever before.
Our research is increasingly being published in top-tier journals, reflecting the exceptional quality and dedication of our team.
KALMA Scientific Day was not just an event — it was a celebration of resilience, growth, and a future built on perseverance.

This scientific day was organized by 𝑷𝒓𝒐𝒇. 𝑴𝒂𝒊𝒅𝒐𝒖𝒏 𝑴𝒐𝒓𝒕𝒂𝒅𝒂, and it featured presentations by our PhD students showcasing the results they produced during the academic year 2024–2025.
Moreover, our team has produced a large number of high-quality papers this year, further demonstrating the strength and impact of our research community.

Finally, we extend our deep appreciation to 𝑷𝒓𝒐𝒇. 𝑨𝒎𝒊𝒏𝒆 𝑬𝒍 𝑺𝒂𝒉𝒊𝒍𝒊, who founded this research family and watched it grow under his care. His vision, leadership, and unwavering support have laid the foundation for everything we continue to build today.

Together, we move forward stronger than ever!

🎓 Hats off to our Master’s students for successfully defending their theses!
This milestone is a testament to your hard work and determination. May your future be filled with even greater successes❤✨️

We are pleased to share that Dr. Maidoun Mortada has been awarded the IMU–Simons Research Fellowship 2025.
This fellowship supported her research stay from July 2 to August 2, 2025 in France 🇫🇷, covering travel and accommodation for her and her children, and allowing her to conduct research in Graph Theory at the University of Burgundy – Dijon.

The Mathematics Department at the Lebanese University is proud to host its KALMA Scientific Day on 25 September — an exclusive academic event where PhD students come together to showcase their latest research and scientific achievements.
A day of knowledge, collaboration, and innovation! 📖✨

Exciting news!!! Pleased to announce the publication of 𝐷𝑟. 𝐷𝑎𝑟𝑖𝑛𝑒 𝐴𝑙-𝑀𝑛𝑖𝑛𝑦 and 𝐷𝑟. 𝑆𝑜𝑢𝑘𝑎𝑖𝑛𝑎 𝑍𝑎𝑦𝑎𝑡'𝑠 paper in 𝑻𝒉𝒆 𝑬𝒍𝒆𝒄𝒕𝒓𝒐𝒏𝒊𝒄 𝑱𝒐𝒖𝒓𝒏𝒂𝒍 𝒐𝒇 𝑪𝒐𝒎𝒃𝒊𝒏𝒂𝒕𝒐𝒓𝒊𝒄𝒔💪🔥
One of the 𝐓𝐎𝐏 𝐐𝟏 journals
ℂ𝕠𝕟𝕘𝕣𝕒𝕥𝕦𝕝𝕒𝕥𝕚𝕠𝕟𝕤!!!

On Subdivisions of Four Blocks Cycles with Two Non-Consecutive Blocks of Length One in Digraphs with Large Chromatic Number | The Electronic Journal of Combinatorics On Subdivisions of Four Blocks Cycles with Two Non-Consecutive Blocks of Length One in Digraphs with Large Chromatic Number Darine Al-Mniny Soukaina Zayat DOI: https://doi.org/10.37236/11790 Abstract A cycle with four blocks $C(k_{1}, k_{2},k_{3},k_{4})$ is an oriented cycle formed of four blocks of...

Very honorable with congratulations of the jury!
PhD thesis defense of Moussa Daamouch at the Lebanese University, under the direction of Prof. Amine El Sahili and Dr. Salman Ghazal, with "VERY HONORABLE" grade.

Thesis title: "A Study on Seymour's Second Neighborhood Conjecture"

Reviewers:
Pr. Olivier Togni
Pr. Youssef BOUDABBOUS

Congratulations!!!

Congratulations to all the Graph Theory Family members for their incredible achievements in 2024! Despite the hardships and challenges of war, you have worked tirelessly and produced remarkable publications. Your resilience and dedication are truly inspiring.

From all of us in the Graph Theory Family, we wish you a joyous and successful 2025! Let’s continue striving for greatness together!

Dr. Maidoun Mortada participated in the 6th Workshop on graph colourings held in Pilsen, June 24-28, 2024.

This workshop focuses on various types of graph colourings with distance or neighbourhood constraints. The aim of the workshop is to discuss some open problems on various types of colourings as well as approaches, methods and techniques.

Dr. Maidoun gave a talk entitled: "S-packing coloring of saturated subcubic graphs" and discussed some open problems with other participants.

Master thesis defense of Hussein Karnib✨️
Thesis title: A Proof of Rosenfeld's Conjecture
Thesis supervisor: Prof. Amine El Sahili
Congratulations on your outstanding work as new techniques are introduced in this thesis, transforming the proof to a simpler proof.

Exciting news!!! Pleased to announce the publication of 𝐷𝑟. 𝑆𝑜𝑢𝑘𝑎𝑖𝑛𝑎 𝑍𝑎𝑦𝑎𝑡'𝑠 paper in 𝑫𝒊𝒔𝒄𝒓𝒆𝒕𝒆 𝑴𝒂𝒕𝒉𝒆𝒎𝒂𝒕𝒊𝒄𝒔 journal👍💪🔥
ℂ𝕠𝕟𝕘𝕣𝕒𝕥𝕦𝕝𝕒𝕥𝕚𝕠𝕟𝕤!!!

Forests and the strong Erdős-Hajnal property Alon et al. proposed an equivalent directed version of the celebrated unresolved conjecture of Erdős and Hajnal which states that for every tournament…