dc.contributor.author |
Ahmed, Ruga Hago |
|
dc.date.accessioned |
2013-11-06T08:56:30Z |
|
dc.date.available |
2013-11-06T08:56:30Z |
|
dc.date.issued |
2011-08-01 |
|
dc.identifier.citation |
Ahmed,Ruga Hago .Gradient Estimates and Intrinsic Ultracontractivity of Neumann and Shrödinger semigroups/Ruga Hago Ahmed;Shawgy Hussein Abd Alla.-Khartoum:Sudan University of Science and Technology,College of Science,2011.-54p. : ill. ; 28cm.-PhD. |
en_US |
dc.identifier.uri |
http://hdl.handle.net/123456789/2091 |
|
dc.description.abstract |
We show the estimation of the logarithmic Sobolev constant and give the gradient estimates of heat semigroups. We study
Wiener’s lemma for localized integral operators on a Hilbert space We consider the stability of localized operators including infinite matrices. We derived an explicit gradient estimates and show the first Neumann eigenvalue on the manifolds with boundary. Also a second fundamental form and gradient of Neumann semigroups are considered .The positvity and negativity with compactness of the ground state energy for the Schrödinger operator on a Hilbert space are shown. We investigate the intrinsic ultracontractivity for
Schrödinger operators based on fractional Laplacian and semigroups on a Hilbert space. |
en_US |
dc.description.sponsorship |
Sudan University of Science and Technology |
en_US |
dc.language.iso |
English |
en_US |
dc.publisher |
Sudan University of Science and Technology |
en_US |
dc.subject |
Neumam Shrodinger Semigroups |
en_US |
dc.title |
Gradient Estimates and Intrinsic Ultracontractivity of Neumann and Shrödinger semigroups |
en_US |
dc.type |
Thesis |
en_US |