Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9500054 | Linear Algebra and its Applications | 2018 | 15 Pages |
Abstract
Let V be a Euclidean Jordan algebra of rank n. A set E in V is said to be a spectral set if there exists a permutation invariant set Q in Rn such that E=λâ1(Q), where λ:VâRn is the eigenvalue map that takes xâV to λ(x) (the vector of eigenvalues of x written in the decreasing order). If the above Q is also a convex cone, we say that E is a spectral cone. This paper deals with connectedness and arcwise connectedness properties of spectral sets. By relying on the result that in a simple Euclidean Jordan algebra, every eigenvalue orbit [x]:={y:λ(y)=λ(x)} is arcwise connected, we show that if a permutation invariant set Q is connected (arcwise connected), then λâ1(Q) is connected (respectively, arcwise connected). A related result is that in a simple Euclidean Jordan algebra, every pointed spectral cone is irreducible.
Related Topics
Physical Sciences and Engineering
Mathematics
Algebra and Number Theory
Authors
M. Seetharama Gowda, Juyoung Jeong,