On the existence of the essential spectrum for a class of differential expressions having normal maximal extensions

Manylion Llyfryddiaeth
Prif Awdur:	Castillo, Maritina T.
Fformat:	Traethawd Ymchwil
Iaith:	English
Cyhoeddwyd:	1999.
Pynciau:	Spectral theory (Mathematics). Differential operators.