Browsing by Subject "Spectrum"

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Convolution in Dual Cesàro Sequence Spaces

[OWP-2022-20] Curbera, Guillermo P.; Ricker, Werner J. (Mathematisches Forschungsinstitut Oberwolfach, 2022-12-16)

We investigate convolution operators in the sequence spaces $d_p$ , for 1 $\leqslant p<\infty$ . These spaces, for $p$ > 1, arise as dual spaces of the Cesàro sequence spaces $ces_p$ thoroughly investigated by G. Bennett. A ...
Spectral Continuity for Aperiodic Quantum Systems II. Periodic Approximations in 1D

[OWP-2018-27] Beckus, Siegfried; Bellissard, Jean; De Nittis, Giuseppe (Mathematisches Forschungsinstitut Oberwolfach, 2018-12-17)

The existence and construction of periodic approximations with convergent spectra is crucial in solid state physics for the spectral study of corresponding Schrödinger operators. In a forthcoming work [9] this task was ...