Results 41 to 50 of about 114 (106)

Lebesgue number and total boundedness

Pracì Mìžnarodnogo Geometričnogo Centru
A generalization of the Lebesgue number lemma is obtained. For a metric space X in the class of strongly metrizable spaces, sufficient conditions for each open cover of X with a Lebesgue number has a finite subcover are obtained.
Ajit Kumar Gupta
doaj   +1 more source

A Coarse Geometric Approach to Graph Layout Problems

Journal of Graph Theory, Volume 113, Issue 2, Page 169-194, October 2026.
ABSTRACT We define a range of new coarse geometric invariants based on various graph–theoretic measures of complexity for finite graphs, including treewidth, pathwidth, cutwidth and bandwidth. We prove that, for bounded degree graphs, these invariants can be used to define functions which satisfy a strong monotonicity property, namely, they are ...
Wanying Huang, David Hume, Samuel J. Kelly, Ryan Lam   +3 more
wiley   +1 more source

Some Common Fixed Point Theorems in Menger PM Spaces

Fixed Point Theory and Applications, 2010
Employing the common property (E.A), we prove some common fixed point theorems for weakly compatible mappings via an implicit relation in Menger PM spaces. Some results on similar lines satisfying quasicontraction condition as well as -type contraction
Tanveer M, Hasan M, Imdad M
doaj  

Aberrant alternative splicing of purinergic receptor P2RX4 prevents sensitivity towards combinatorial treatment in colorectal and pancreatic cancer

The Journal of Pathology, Volume 270, Issue 1, Page 55-68, September 2026.
Abstract Recently, we suggested the combination of chemotherapy and P2RX4 inhibition as a promising novel therapeutic approach for P2RX4‐expressing epithelial tumors to prevent paracrine resistance. Here, we aimed to assess whether determining P2RX4 expression status in colorectal and pancreatic cancer patients would allow stratification of potentially
Christoph Steup, Julian Dosch, Christopher Dietz‐Fricke, Sara Khosraviseftejani, Esther Engel, Adalbert F de Valk, Dominic Menger, Patrick Welker, Peter J Wild, Kilian B Kennel, Maja Kantlehner, Paul K Ziegler, Florian R Greten   +12 more
wiley   +1 more source

The functional characterizations of the Rothberger and Menger properties

Topology and its Applications, 2018
Let \(X\) be a Tychonoff space and \(C_p(X)\) be the space of all continuous real-valued functions defined on \(X\) with the topology of pointwise convergence. A space \(X\) is said to be Rothberger if for every sequence \(\{ \mathcal{U}_n : n \in\mathbb{N}\}\) of open covers of \(X\), there is a sequence \(\{ V_n : n \in\mathbb{N}\}\) such that \(V_n \
openaire   +2 more sources

Vergleichende Untersuchung der Eigenschaften recycelter Kohlenstofffasern Comparative investigation of the properties of recycled carbon fibers

Chemie Ingenieur Technik, Volume 98, Issue 8, Page 485-494, August 2026.
Die Akzeptanz recycelter Kohlenstofffasern in der Industrie erfordert eine hohe und standardisierte Faserqualität. In diesem Artikel werden mechanische Eigenschaften sowie die Oberflächenqualität neuer und recycelter Kohlenstofffasern ermittelt und verglichen, um Optimierungspotentiale für das CFK‐Recycling abzuleiten.
Philipp Karsten Niebel, Violetta Schumm, Mareen Zöllner, Thomas Krampitz, Holger Lieberwith, Marcel Zeisberg, Enrico Baumgärtel, Jens Bachmann   +7 more
wiley   +1 more source

Secure Decentralized Key Relaying via Random Walks in Dynamic Semi‐Trusted QKD Networks

Advanced Quantum Technologies, Volume 9, Issue 8, August 2026.
Quantum Key Distribution (QKD) provides point‐to‐point, information‐theoretically secure session keys, but distance limitations require trusted relays between remote parties. Can quantum keys be relayed without trusting every intermediate node or depending on a central controller?
Sergejs Kozlovičs, Krišjānis Petručeņa, Elina Kalnina, Juris Viksna   +3 more
wiley   +1 more source

How to see the forest despite the trees

Journal of the London Mathematical Society, Volume 114, Issue 2, August 2026.
Abstract One of the major starting points of discrete optimization is the theorem of Nash‐Williams and Tutte on the existence of k$k$ disjoint spanning trees of a graph, along with its counterpart on the existence of k$k$ forests covering all edges of the graph.
Erika Bérczi‐Kovács, András Frank
wiley   +1 more source

Softwar and Power Projection in the Digital Age: A Book Review Through the Lens of the Austrian School of Economics

Mises
This article presents a critical analysis Softwar: A Novel Theory on Power Projection and the National Strategic Significance of Bitcoin by Jason P. Lowery.
Marcos Giansante
doaj   +1 more source

An EZ${\mathcal {E}\mathcal {Z}}$‐structure for the mapping class group

Proceedings of the London Mathematical Society, Volume 133, Issue 2, August 2026.
Abstract We construct a boundary for the mapping class group Mod(S)${\rm Mod}(S)$ of a surface S$S$ of finite type. The action of Mod(S)${\rm Mod}(S)$ on this boundary is minimal, strongly proximal and topologically free. The boundary is the boundary of an EZ${\mathcal {E}\mathcal {Z}}$‐structure for Mod(S)${\rm Mod}(S)$.
Ursula Hamenstädt
wiley   +1 more source