David Gross’s Reviews > Spectra and Pseudospectra: The Behavior of Nonnormal Matrices and Operators > Status Update
David Gross
is on page 499 of 624
"Quantum mechanics helped make the idea of group velocity famous. By contrast, quantum mechanics helped keep the idea of pseudospectra hidden, for quantum mechanical operators are Hermitian, and their Hermitian behavior shaped scientists' conceptions of eigenvalues and eigenvectors for generations." (p. 497)
Way to go quantum mechanics.
— Mar 08, 2014 04:03PM
Way to go quantum mechanics.
Like flag
David’s Previous Updates
David Gross
is on page 487 of 624
Hessenberg is quite different from Heisenberg
— Mar 05, 2014 06:36PM
David Gross
is on page 475 of 624
Contours integrals of the matrix resolvent in the complex plane around eigenvalues give you their spectral projector. Just sayin.
— Feb 20, 2014 07:12AM
David Gross
is on page 455 of 624
Distances to normality, singularity, and instability are all strikingly straightforward while not without deeply undermining counterexamples. Skimming pages 84 to 420 to catch on my return trip through the book...
— Jan 22, 2014 10:47AM
David Gross
is on page 46 of 624
"Those who find it worthy of remark that the word 'eigenvalue' is a blend of two languages may take pleasure in noting that 'pseudoeigenvalue', for better or worse, is a combination of three."
— Jan 08, 2014 01:49PM
David Gross
is on page 16 of 624
"In the highly non-normal case, vivid though the image may be, the location of the eigenvalues may be as fragile an indicator of underlying character as the hair color of a Hollywood actor." p. 11
— Nov 19, 2013 02:02PM
