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math.FA2026
Duality for Delsarte's extremal problem on locally compact Abelian groups
Elena E. Berdysheva, Bálint Farkas, Marcell Gaál +2
The Delsarte extremal problem for positive definite functions, originally introduced by Delsarte in coding theory to bound the size of error-correcting codes, has since found appli…
math.FA2023
The pointwise limit of metric integral operators approximating set-valued functions
Elena E. Berdysheva, Nira Dyn, Elza Farkhi +1
For set-valued functions (SVFs, multifunctions), mapping a compact interval into the space of compact non-empty subsets of , we study approximation based on…