𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Perturbations of Globally Hypoelliptic Operators

✍ Scribed by A.P. Bergamasco

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
454 KB
Volume
114
Category
Article
ISSN
0022-0396

No coin nor oath required. For personal study only.

πŸ“œ SIMILAR VOLUMES

Hypoellipticity of Some Degenerate Subel
Hypoellipticity of Some Degenerate Subelliptic Operators
✍ J.J Kohn πŸ“‚ Article πŸ“… 1998 πŸ› Elsevier Science 🌐 English βš– 253 KB

The purpose of this paper is to establish the following result. Let L 1 and L 2 be subelliptic operators on R n x and R m y , respectively. Assume that \* # C (R n x ) with \* 0, assume that \* has a zero of infinite order at the origin and that all other zeroes of \* are of finite order. Then the

On the essential spectrum of hypoellipti
On the essential spectrum of hypoelliptic pseudo-differential operators
✍ Ernesto Buzano; Andrea Ziggioto πŸ“‚ Article πŸ“… 2008 πŸ› John Wiley and Sons 🌐 English βš– 239 KB

## Abstract We describe the essential spectrum of a hypoelliptic pseudo‐differential operator which is the sum of a constantcoefficients operator and an operator with coefficients vanishing at infinity. (Β© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Bounds on Perturbations of Self-Adjoint
Bounds on Perturbations of Self-Adjoint Operators
✍ Edward L. Green πŸ“‚ Article πŸ“… 1996 πŸ› Elsevier Science 🌐 English βš– 160 KB

An improvement of a perturbation theory lemma by M. M. Skriganov which gives an upper bound to the shift of eigenvalues is presented along with other related theorems. These results are also compared with Temple's inequality and the generalized Temple's inequality. Applications to spectral theory of