Results 71 to 80 of about 165,985,528 (155)

Nonamenable subforests of multi‐ended quasi‐pmp graphs

open access: yesProceedings of the London Mathematical Society, Volume 133, Issue 3, September 2026.
Abstract We prove the a.e. nonamenability of locally finite quasi‐pmp Borel graphs whose every component admits at least three nonvanishing ends with respect to the underlying Radon–Nikodym cocycle. We witness their nonamenability by constructing Borel subforests with at least three nonvanishing ends per component, and then applying Tserunyan and ...
Ruiyuan Chen   +2 more
wiley   +1 more source

Effective length‐projection bounds for hyperbolic 3‐manifolds diffeomorphic to S×R$S\times \mathbb {R}$

open access: yesJournal of Topology, Volume 19, Issue 3, September 2026.
Abstract We give a formula with explicit constants relating the subsurface projection dY(ν−,ν+)$d_Y(\nu ^-,\nu ^+)$ of the end invariants ν−,ν+$\nu ^-,\nu ^+$ of a hyperbolic 3‐manifold Q$Q$ diffeomorphic to S×R$S\times \mathbb {R}$ and the length of the geodesic representative in Q$Q$ of the multicurve ∂Y$\partial Y$.
Gabriele Viaggi
wiley   +1 more source

Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight

open access: yesExperimental Physiology, Volume 111, Issue 9, Page 4015-4040, 1 September 2026.
Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
wiley   +1 more source

A class of partially ordered sets: II

open access: yes, 1998
Hemion G. A class of partially ordered sets: II. Chaos, Solitons & Fractals. 1998;9(7):1219-1232.In a previous paper, a certain class of discrete partially ordered sets was defined and a number of general properties of the sets was described.
Geoffrey Hemion, Hemion, Geoffrey
core   +1 more source

Contribution of Urbanization and Large‐Scale Warming to Temperature Increase From Pre‐Industrial Revolution Time to Recent Period in Central Beijing City

open access: yesGeophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract The annual mean Surface Air Temperature (SAT) observed during 1757–1762 in central Beijing was 3.1°C lower than that of the nearby Autonomous Weather Stations (AWS) in recent 6 years (2015–2020). The change was much larger than the averaged global warming of the past century.
Guoyu Ren   +4 more
wiley   +1 more source

Algebraic Combinatorics

open access: yes, 2005
Applications of algebra to combinatorics and conversely. Topics include enumeration methods, partially ordered sets and lattices, matching theory, partitions and tableaux, algebraic graph theory, and combinatorics of ...
Postnikov, Alexander
core  

Total compactness of a-inductive partially ordered sets [PDF]

open access: yes, 1990
A poset (i.e., partially ordered set) P is called A-inductive iff every nonempty well ordered subset W of P has a supremum (i.e., least upper bound) wich need not be an element of ...
Abian, Alexander, Kemp, Paula A.
core  

On Sums Over Partially Ordered Sets

open access: yes, 1999
We establish a general theorem for reducing sums of type # y#x g(y) where g is a mapping from a partially ordered set into an abelian group. Conclusions concern the Mobius function, the principle of inclusionexclusion, the Tutte polynomial and ...
Klaus Dohmen
core  

Some Properties of Partially Ordered Sets [PDF]

open access: yes, 1966
It may be said of certain pairs of elements of a set that one element precedes the other. If the collection of all such pairs of elements in a given set exhibits certain properties, the set and the collection of pairs is said to constitute a partially ...
Hudson, Philip Wayne
core  

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