The paper introduces spectral generalized Turán numbers, proves a general transfer theorem from counting stability to spectral extremality, and derives a spectral Erdős Pentagon Theorem and an entropy formula.
Generalized Andr\'{a}sfai--Erd\H{o}s--S\'{o}s theorems for odd cycles
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abstract
In this note, we establish Andr\'{a}sfai--Erd\H{o}s--S\'{o}s-type stability theorems for two generalized Tur\'{a}n problems involving odd cycles, both of which are extensions of the Erd\H{o}s Pentagon Problem. Our results strengthen previous results by Lidick\'{y}--Murphy~\cite{LM21} and Beke--Janzer~\cite{BJ24}, while also simplifying parts of their proofs.
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Spectral generalized Tur\'{a}n problems
The paper introduces spectral generalized Turán numbers, proves a general transfer theorem from counting stability to spectral extremality, and derives a spectral Erdős Pentagon Theorem and an entropy formula.