Convex Trace Functions and the Wigner-Yanase-Dyson Conjecture
Convexity around the Unit of a Banach Algebra
2000 Mathematics Subject Classification: Primary: 46B20. Secondary: 46H99, 47A12.We estimate the (midpoint) modulus of convexity at the unit 1 of a Banach algebra A showing that inf {max±||1 ± x|| − 1 : x ∈ A, ||x||=ε} ≥ (π/4e)ε²+o(ε²) as ε → 0. We also give a characterization of two-dimensional subspaces of Banach algebras containing the identity in terms of polynomial inequalities.
Convexity, boundedness, and almost periodicity for differential equations in Hilbert space.
Convexity of the set of fixed points generated by some control systems.
Convexly totally bounded and strongly totally bounded sets. Solution of a problem of Idzik
Convoluted -groups
Convoluted C-operator families and abstract Cauchy problems
Convolution and S' - Convolution of Distributions
Convolution of Nörlund methods in non-archimedean fields
Convolution of Operators and Applications.
Convolution operators in infinite dimension.
Convolution operators on expanding polyhedra: limits of the norms of inverse operators and pseudospectra.
Convolution operators on Kucera-type spaces for the Hankel transformation
Convolution operators on spaces of holomorphic functions
A class of convolution operators on spaces of holomorphic functions related to the Hadamard multiplication theorem for power series and generalizing infinite order Euler differential operators is introduced and investigated. Emphasis is placed on questions concerning injectivity, denseness of range and surjectivity of the operators.
Convolution Semigroups of Local Type.
Convolution-dominated integral operators
For a locally compact group G we consider the algebra CD(G) of convolution-dominated operators on L²(G), where an operator A: L²(G) → L²(G) is called convolution-dominated if there exists a ∈ L¹(G) such that for all f ∈ L²(G) |Af(x)| ≤ a⋆|f|(x), for almost all x ∈ G. (1) The case of discrete groups was treated in previous publications [fgl08a, fgl08]. For non-discrete groups we investigate a subalgebra of regular convolution-dominated operators generated by product convolution operators, where the...
Convolutions on compact groups and Fourier algebras of coset spaces
We study two related questions. (1) For a compact group G, what are the ranges of the convolution maps on A(G × G) given for u,v in A(G) by u × v ↦ u*v̌ (v̌(s) = v(s^-1)) and u × v ↦ u*v? (2) For a locally compact group G and a compact subgroup K, what are the amenability properties of the Fourier algebra of the coset space A(G/K)? The algebra A(G/K) was defined and studied by the first named author. In answering the first question, we obtain, for compact groups which do not...
Copies of ’s uniformly in the spaces and
We study the presence of copies of ’s uniformly in the spaces and . By using Dvoretzky’s theorem we deduce that if is an infinite-dimensional Banach space, then contains -uniformly copies of ’s and contains -uniformly copies of ’s for all . As an application, we show that if is an infinite-dimensional Banach space then the spaces and are distinct, extending the well-known result that the spaces and are distinct.
Corner Mellin operators and reduction of orders with parameters
Correct selfadjoint and positive extensions of nondensely defined minimal symmetric operators.