E. Kastis

activity

20142025

most citedThe first-order flexibility of a crystal framework

2 citations · 3 across the 10 of their papers we have counts for

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3 papers · 1 filter

math.FA2025

The Rigid Unit Mode spectrum for symmetric frameworks

Eleftherios Kastis, Derek Kitson

We establish several fundamental properties of the Rigid Unit Mode (RUM) spectrum for symmetric frameworks with a discrete abelian symmetry group and arbitrary linear constraints.…

math.FA2020

Symbol functions for symmetric frameworks

Eleftherios Kastis, Derek Kitson, John E. McCarthy

We prove a variant of the well-known result that intertwiners for the bilateral shift on ` $ℓ^{2} (Z)$ are unitarily equivalent to multiplication operators on $L^{2} (T)$ . This enables…

math.FA2016

The parabolic algebra on Banach spaces

Eleftherios Kastis

The parabolic algebra was introduced by Katavolos and Power, in 1997, as the operator algebra acting on $L^{2} (R)$ that is weakly generated by the translation and multiplication semi…