English
[edit]Noun
[edit]spectral set (plural spectral sets)
- (mathematics) In operator theory, a set 👁 {\displaystyle X\subseteq \mathbb {C} }
such that, for a (possibly unbounded) linear operator 👁 {\displaystyle T}
on a Banach space, the spectrum of 👁 {\displaystyle T}
is in 👁 {\displaystyle X}
and von Neumann's inequality holds for 👁 {\displaystyle T}
on 👁 {\displaystyle X}
.
