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29.302  Articles
1 of 2.931 pages  |  10  records  |  more records»
In this work, we introduce the concepts of compactly invariant and uniformly invariant. Also we define sometimes C-invariant closed subspaces and then prove every m-dimensional normed space with m > 1 has a nontrivial sometimes C-invariant closed subsp... see more

Let T be a bounded linear operator on a Banach space X into itself. In this paper, we study the uniform ergodicity of the operator T|Y when Y is a closed subspace invariant under T. We show that if T satisfies, lim n ? 8 ? T n ? n = 0 , then T is uniforml... see more

We give a direct proof of sandwich-type theorems for linear invariant partially ordered vector space operators in the setting of convexity. As consequences, we deduce equivalence results between sandwich, Hahn-Banach, separation and Krein-type extension t... see more

The article shows the result of solving the problem on the stressed-and-strained state of an elastic semi-space because of the load action, which is uniformly distributed over the strip of constantly width and final or infinite length, with the use of non... see more

It is shown that, on the one hand, quantum moment maps give rise to examples for the operator-theoretic approach to invariant integration theory developed by K.-D. Kürsten and the second author, and that, on the other hand, the operator-theoretic approach... see more

Banach space operators acting on some fixed space X are considered. If two such operators A and B verify the condition A2=B2 and if A has nontrivial hyperinvariant subspaces, then B has nontrivial invariant subspaces. If A and B commute and satisfy a spec... see more

An approach to wideband beamformer with frequency invariant property is proposed by optimising the space-time two-dimensional finite impulse response (FIR) filters. Frequency invariant beam pattern brings some restrictions on frequency bandwith and filter... see more

The research deals with the conceptual foundations of the pedagogy of freedom as a qualitatively new direction of alternative pedagogy, which successfully functions in the paradigmatic space of upbringing systems of humanistic orientation. The historical ... see more

The method of invariant embedding for the solutions of boundary value problems yields an equivalent formulation to the initial boundary value problems by a system of Riccati operator differential equations. A combined technique based on invariant embeddin... see more

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