Results 41 to 50 of about 1,820 (180)
The Ultrafilter Closure in ZF [PDF]
Mathematical Logic Quarterly, 2010 AbstractIt is well known that, in a topological space, the open sets can be characterized using ?lter convergence. In ZF (Zermelo‐Fraenkel set theory without the Axiom of Choice), we cannot replace filters by ultrafilters. It is proven that the ultra?lter convergence determines the open sets for every topological space if and only if the Ultrafilter ...
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Some applications of Q-points and Lebesgue filters to Banach spaces
Extracta MathematicaeWe present a new characterization of Q-point ultrafilters and use it to optimize the result of Avilés, Martı́nez-Cervantes, and Rueda Zoca linking the existence of L-orthogonal sequences and L-orthogonal elements in Banach spaces via ultrafilter limits.
M. Hrušák, L. Sáenz
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Journal of Extracellular Biology, Volume 5, Issue 7, July 2026.ABSTRACT Plant‐derived extracellular vesicles (EVs) have shown numerous health benefits, including modulation of the human gut microbiota. Herein, we employed isothermal microcalorimetry (IMC) to explore the effects of ginger‐derived nanovesicles (G‐NVs) on the growth and metabolic activity of Bacteroides thetaiotaomicron (Bt), a dominant saccharolytic
Francesca Loria +12 more
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Reasonable Ultrafilters, Again
Notre Dame Journal of Formal Logic, 2011 We continue investigations of reasonable ultrafilters on uncountable cardinals defined in math.LO/0407498. We introduce stronger properties of ultrafilters and we show that those properties may be handled in lambda-support iterations of reasonably bounding forcing notions.
Andrzej Roslanowski, Saharon Shelah
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Choice principles and lift lemmas [PDF]
Categories and General Algebraic Structures with Applications, 2017 We show that in {bf ZF} set theory without choice, the Ultrafilter mbox{Principle} ({bf UP}) is equivalent to several compactness theorems for Alexandroff discrete spaces and to Rudin's Lemma, a basic tool in topology and the theory of quasi-continuous ...
Marcel Ern'e
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Convergence and quantale-enriched categories [PDF]
Categories and General Algebraic Structures with Applications, 2018 Generalising Nachbin's theory of ``topology and order'', in this paper we continue the study of quantale-enriched categories equipped with a compact Hausdorff topology.
Dirk Hofmann, Carla D. Reis
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Advanced Science, Volume 13, Issue 32, 9 June 2026.A mitochondria‐targeted copper depletion nanoplatform (CYN‐CDA@Alb) was developed to selectively disrupt tumor mitochondria copper, which then reprogrammed the tumor immune microenvironment by depressing PD‐L1 and CD47 expression simultaneously. By doing this, CYN‐CDA@Alb reversed radiotherapy‐induced immune tolerance, showing the potential usage of ...
Zaigang Zhou +10 more
wiley +1 more source
On the Spectrum of Characters of Ultrafilters [PDF]
Notre Dame Journal of Formal Logic, 2018 We show that the character spectrum $Sp_χ(λ)$, for a singular cardinal $λ$ of countable cofinality, may include any prescribed set of regular cardinals between $λ$ and $2^λ$.
Shimon Garti +2 more
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Landscape wetness and beaver wetlands enhance environmental prevalence of Francisella spp.
Ecosphere, Volume 17, Issue 6, June 2026.Abstract Identifying the contributions of biotic and abiotic factors in pathogen transmission is essential to mitigate vector‐borne and zoonotic disease risk. Francisella tularensis is the etiological agent of the infectious disease tularemia in wildlife and humans. Environmental factors driving transmission in wildlife, including the role of hares and
Lovisa Hökby +9 more
wiley +1 more source
Ideals and Their Generic Ultrafilters
Notre Dame Journal of Formal Logic, 2020 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
David Chodounský, Jindrich Zapletal
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