A new theorem on exponential stability of periodic evolution families on Banach spaces.
A non elliptic spectral problem related to the analysis of superconducting micro-strip lines
This paper is devoted to the spectral analysis of a non elliptic operator , deriving from the study of superconducting micro-strip lines. Once a sufficient condition for the self-adjointness of operator has been derived, we determine its continuous spectrum. Then, we show that is unbounded from below and that it has a sequence of negative eigenvalues tending to . Using the Min-Max principle, a characterization of its positive eigenvalues is given. Thanks to this characterization, some conditions...
A non elliptic spectral problem related to the analysis of superconducting micro-strip lines
This paper is devoted to the spectral analysis of a non elliptic operator A , deriving from the study of superconducting micro-strip lines. Once a sufficient condition for the self-adjointness of operator A has been derived, we determine its continuous spectrum. Then, we show that A is unbounded from below and that it has a sequence of negative eigenvalues tending to -∞. Using the Min-Max principle, a characterization of its positive eigenvalues is given. Thanks to this characterization, some...
A Non-Commutative Individual Ergodic Theorem.
A note on a formula for the fractional powers of infinitesimal generators of semigroups
If -A is the generator of an equibounded -semigroup and 0 < Re α < m (m integer), its fractional power can be described in terms of the semigroup, through a formula that is only valid if a certain function is nonzero. This paper is devoted to the study of the zeros of .
A note on a local ergodic theorem
A note on a theorem of Vidav
A note on absolutely P-summing operators.
A note on best approximation and invertibility of operators on uniformly convex Banach spaces.
A note on cocycles in ergodic theory
A note on continuous restrictions of linear maps between Banach spaces.
A note on convergence of semigroups
Convergence of semigroups which do not converge in the Trotter-Kato-Neveu sense is considered.
A Note on Eigenvalue Problems with Eigenvalue Parameter in the Boundary Conditions.
A note on embedding into product spaces
Using factorization properties of an operator ideal over a Banach space, it is shown how to embed a locally convex space from the corresponding Grothendieck space ideal into a suitable power of , thus achieving a unified treatment of several embedding theorems involving certain classes of locally convex spaces.
A note on extreme contractions on -spaces
A note on general dilation theorems
A note on generalized projections in c₀
Let V ⊂ Z be two subspaces of a Banach space X. We define the set of generalized projections by . Now let X = c₀ or , Z:= kerf for some f ∈ X* and (n < m). The main goal of this paper is to discuss existence, uniqueness and strong uniqueness of a minimal generalized projection in this case. Also formulas for the relative generalized projection constant and the strong uniqueness constant will be given (cf. J. Blatter and E. W. Cheney [Ann. Mat. Pura Appl. 101 (1974), 215-227] and G. Lewicki...
A note on joint capacities in Banach algebras
A note on operator convergence for semigroups
A note on -hyponormal operators.