Polynominal approximation in certain weighted Hilbert spaces of entire functions.
Polytope in lokalkonvexen Räumen.
Pontryagin duality and topological algebras
Pontryagin Duality for Subgroups and Quotients of Nuclear Spaces.
P-order necessary and sufficient conditions for optimality in singular calculus of variations
This paper is devoted to singular calculus of variations problems with constraint functional not regular at the solution point in the sense that the first derivative is not surjective. In the first part of the paper we pursue an approach based on the constructions of the p-regularity theory. For p-regular calculus of variations problem we formulate and prove necessary and sufficient conditions for optimality in singular case and illustrate our results by classical example of calculus of variations...
Porosity and compacta with dense ambiguous loci of metric projections
Porosity and continuous, nowhere differentiable functions
Porosity of convex nowhere dense subsets of normed linear spaces.
Positive Approximate Identities and Lattice-Ordered Dual spaces.
Positive bases in ordered subspaces with the Riesz decomposition property
In this article we suppose that E is an ordered Banach space whose positive cone is defined by a countable family of positive continuous linear functionals on E, i.e. E₊ = x ∈ E | for each i, and we study the existence of positive (Schauder) bases in ordered subspaces X of E with the Riesz decomposition property. We consider the elements x of E as sequences and we develop a process of successive decompositions of a quasi-interior point of X₊ which at each step gives elements with smaller support....
Positive Compact Operators on Banach Lattices.
Positive cones associated with a von Neumann algebra.
Positive Contractions of L2-Spaces.
Positive C...-semigroups on C*-algebras.
Positive definite diagonal sequences
Positive Definite Kernels on the Complex Hilbert Sphere.
Positive Elements and the B* Condition.
Positive Embeddings of C (...), L1, lt (...), and (......)1.
Positive energy representations for quantum spin models in 1+1 dimensions
We present recent results on positive energy representations of quantum spin models.
Positive functionals and the axiom of choice