Results 291 to 300 of about 1,190,060 (329)

3D ultra-broadband optically dispersive microregions in lithium niobate. [PDF]

open access: yesNat Commun
Zhang B   +12 more
europepmc   +1 more source

A common grounded ultra-wideband diversity/MIMO antenna with high inter-element isolation. [PDF]

open access: yesSci Rep
Shailesh   +5 more
europepmc   +1 more source

On Finally Compact Spaces

Acta Mathematica Hungarica, 2001
For an infinite cardinal \(\kappa\), \(\kappa^+\) denotes the smallest cardinal greater than \(\kappa\). A space \(X\) is called finally \(\kappa^+\)-compact if every open cover of \(X\) has a subcover with cardinality \(\leq\kappa\). The authors define weakly \(\kappa\overline{\theta}\)-refinable spaces and study conditions under which a countably ...
T. Noiri, N. Ergun
openaire   +2 more sources

Homomorphism-Compact Spaces

Canadian Journal of Mathematics, 1983
In 1979 Edgar asked for a characterization of those completely regular Hausdorff topological spaces X which have the property that any Boolean σ-homomorphism from the Baire σ-field of X into the measure algebra of an arbitrary complete probability space can be realized by a measurable point-mapping. Those spaces X will be called homomorphism-compact or,
A. G. A. G. Babiker, Siegfried Graf
openaire   +2 more sources

C-compact spaces

Mathematical Notes of the Academy of Sciences of the USSR, 1972
We consider the properties of C-compact spaces. A negative answer is given to the questions posed by Viglino (RZhMat., 1970, 10 A 302): 1) Is every C-compact space a space of the second category? 2) Is the product of C compacta a C compactum? 3) Is a space, every continuous mapping of which is closed, a C compactum?
openaire   +2 more sources

Compact measure spaces

Mathematika, 1999
Summary: A (countably) compact measure is one which is inner regular with respect to a (countably) compact class of sets. This note characterizes compact probability measures in terms of the representation of Boolean homomorphisms of their measure algebras, and shows that the same ideas can be used to give a direct proof of J.
openaire   +3 more sources

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