| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4600736 | Linear Algebra and its Applications | 2012 | 11 Pages |
Abstract
Denote the joint numerical radius of an m-tuple of bounded operators A=(A1,…,Am) by w(A). We give a complete description of maps f satisfying w(A-B)=w(f(A)-f(B)) for any two m-tuples of operators A=(A1,…,Am) and B=(B1,…,Bm). We also characterize linear isometries for the joint numerical radius, and maps preserving the joint numerical range of A.
Related Topics
Physical Sciences and Engineering
Mathematics
Algebra and Number Theory
