DSpace Collection: http://www.openstarts.units.it:80/dspace/handle/10077/4384 Thu, 20 Jun 2013 07:08:59 GMT 2013-06-20T07:08:59Z Elementary operator-theoretic proof of Wienner's Tauberian Theorem http://www.openstarts.units.it:80/dspace/handle/10077/4427 Title: Elementary operator-theoretic proof of Wienner's Tauberian Theorem Authors: Van Neerven, J. M. A. M. Abstract: We present a short and elementary proof of Wiener's general Tauberian theorem based on the theory of one-parameter groups of operators. Type: Articolo Mon, 01 Jan 1996 00:00:00 GMT http://www.openstarts.units.it:80/dspace/handle/10077/4427 1996-01-01T00:00:00Z Carleman estimates and exact boundary controllabilty for a system of coupled non-conservative Schödinger Equations http://www.openstarts.units.it:80/dspace/handle/10077/4426 Title: Carleman estimates and exact boundary controllabilty for a system of coupled non-conservative Schödinger Equations Authors: Triggiani, Roberto Abstract: We consider a system of 2 (or more) coupled Schródinger equations in the difficult situation where the equations have first-order, lower-order terms, as well as first-order coupling in all space variables. By using a general differential multiplier we give a `friendly’ proof of earleman estimates. Under more restrictive intrinsic conditions mostly on the coupling operators, we obtain eaact controllability results for the coupled system, under various combinations of boundary controls: Dirichlet/Dirichlet; Dirichlet/Neumann; Neumann/Neumann. The controls are active on a suitable portion of the boundary. These results cannot be obtained by standard multipliers. Type: Articolo Mon, 01 Jan 1996 00:00:00 GMT http://www.openstarts.units.it:80/dspace/handle/10077/4426 1996-01-01T00:00:00Z On commutative sums of generators http://www.openstarts.units.it:80/dspace/handle/10077/4425 Title: On commutative sums of generators Authors: Thieme, Horst R. Abstract: The theorem by Da Prato and Grisvard on resolvent commutative sums of linear m-dissipatine operators is recast and extended in the framework of integrated semigroups. Type: Articolo Mon, 01 Jan 1996 00:00:00 GMT http://www.openstarts.units.it:80/dspace/handle/10077/4425 1996-01-01T00:00:00Z Hopf's Lemma and two dimensional domains with corners http://www.openstarts.units.it:80/dspace/handle/10077/4424 Title: Hopf's Lemma and two dimensional domains with corners Authors: Sweers, Guido Type: Articolo Mon, 01 Jan 1996 00:00:00 GMT http://www.openstarts.units.it:80/dspace/handle/10077/4424 1996-01-01T00:00:00Z