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Title: Roth's method and the Yosida approximation for pseudodifferential operators with negative definite symbols
Author: Potrykus, A.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2005
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This thesis consists of two parts. The first one extends an idea developed by J.P. Roth. He succeeded to construct a Feller semigroup associated with a second order elliptic differential operator L(x,D) by investigating the semi-groups obtained by freezing the coefficients of L(x,D). In Chapter 2 we show that a modification of his method works also for certain pseudodifferential operators with bounded negative definite symbols. Partly we can rely on ideas of E. Popescu.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available