[Turkmath:7465] Akdeniz Üniversitesi Fen Fakültesi Matematik Bölümü Genel Seminerleri

[Ayhan Dil]

Merhaba,
Akdeniz Üniversitesi Fen Fakültesi Matematik Bölümü Genel Seminerleri kapsamında, bu hafta aşağıdaki bilgileri verilen seminer gerçekleştirilecektir. Seminerimize Antalya'da olan herkesi bekleriz. Seminerin posteri ektedir.

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• Prof. Dr. Yusuf CİVAN

•Süleyman Demirel Üniversitesi, Mühendislik ve Doğa Bilimleri Fakültesi, Matematik Bölümü

•Problems surrounding the Hadwiger number of graphs topologically


•Tarih: 16 Nisan 2026, Perşembe
•Saat: 15:30
•Yer: Matematik Bölümü Seminer Salonu

Özet:
For a (finite and simple) graph $G$, its Hadwiger number $had(G)$ is defined to be the largest integer $h$ such that $G$ contains the complete graph $K_h$ as a minor. The most long standing and intriguing conjecture of Hugo Hadwiger ($1943$) claims that the inequality $\chi(G)\leq had(G)$ holds for every graph $G$, where $\chi(G)$ denotes the chromatic number. As opposed to the Hadwiger number, the chromatic number of graphs is topologically lower bounded. That brings the question of whether these topological  bounds  are also valid lower bounds to the Hadwiger number. I hope to address these questions in detail as well as a recent conjectural detection of the Hadwiger number due to Holmsen, Kim and Lee  $(2019)$ in terms of the homological dimension of hypergraphs of connected covers. Independent of the later conjecture, I will prove that the Helly number of (simple) hypergraphs can be topologically lower bounded.


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Teşekkürler

Doç. Dr. Ayhan DİL
Matematik Bölümü Seminer Koordinatörü



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