2 papers
math.FA2024★ 2 cited
The algebraic numerical range as a spectral set in Banach algebras
Hanna Blazhko, Daniil Homza, Felix L. Schwenninger +2
We investigate when the algebraic numerical range is a -spectral set in a Banach algebra. While providing several counterexamples based on classical ideas as well as combinatori…
math.CO2024
On quadratic embeddability of bipartite graphs and theta graphs
Wojciech Młotkowski, Marek Skrzypczyk, Michał Wojtylak
We compute the quadratic embedding constant for complete bipartite graphs with disjoint edges removed. Moreover, we study the quadratic embedding property for theta graphs, i.e., g…