DSpace Collection:
http://www.openstarts.units.it:80/dspace/handle/10077/4384
2016-10-01T10:40:22ZElementary 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: Articolo1996-01-01T00:00:00ZCarleman 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: Articolo1996-01-01T00:00:00ZOn 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: Articolo1996-01-01T00:00:00ZHopf'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: Articolo1996-01-01T00:00:00Z