M. Marletta

activity

19982026

most citedBoundary triplets and M-functions for non-selfadjoint operators, with applications to elliptic PDEs and block operator matrices

87 citations · 96 across the 15 of their papers we have counts for

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Showing 2019 · math.SPShow all

2 papers · 2 filters

math.SP2019

Essential numerical ranges for linear operator pencils

Sabine Bögli, Marco Marletta

We introduce concepts of essential numerical range for the linear operator pencil $λ \mapsto A - λ B$ . In contrast to the operator essential numerical range, the pencil essential numer…

math.SP2019

The essential numerical range for unbounded linear operators

Sabine Bögli, Marco Marletta, Christiane Tretter

We introduce the concept of essential numerical range $W_{e} (T)$ for unbounded Hilbert space operators $T$ and study its fundamental properties including possible equivalent char…