#fejér kernels

topicfejér kernels

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math.CA2026

The exact -norm supremum of Walsh--Kaczmarz--Fejér kernels

István Blahota

The paper determines the exact L1‑norm supremum of Fejér kernels for the Walsh–Kaczmarz system, proving a limit of 4/3 for dyadic indices and a global supremum of 71/50.