On Eigenvalues Eigenfunctions and Resolvents of General Elliptic Problems

2011 ◽  
pp. 1-37
Author(s):  
Shmuel Agmon
2005 ◽  
Vol 2005 (7) ◽  
pp. 733-756 ◽  
Author(s):  
A. Volpert ◽  
V. Volpert

The paper is devoted to general elliptic problems in the Douglis-Nirenberg sense. We obtain a necessary and sufficient condition of normal solvability in the case of unbounded domains. Along with the ellipticity condition, proper ellipticity and Lopatinsky condition that determine normal solvability of elliptic problems in bounded domains, one more condition formulated in terms of limiting problems should be imposed in the case of unbounded domains.


1992 ◽  
Vol 13 (1) ◽  
pp. 227-242 ◽  
Author(s):  
Charles H. Tong ◽  
Tony F. Chan ◽  
C. C. Jay Kuo

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