Results 51 to 60 of about 665,193 (301)

An obstruction based approach to the Kochen-Specker theorem

, 1999
In [1] it was shown that the Kochen Specker theorem can be written in terms of the non-existence of global elements of a certain varying set over the partially ordered set of boolean subalgebras of projection operators on some Hilbert space.
Bub J, Butterfield J, Cabello A, Clifton R, Clifton R, Clifton R, Isham C J, J Hamilton, Kochen S, Peres A   +9 more
core   +2 more sources

Speciation Through the Lens of Population Dynamics: A Theoretical Primer on How Small and Large Populations Diverge

Population Ecology, EarlyView.
Population size and dynamics fundamentally shape speciation by influencing genetic drift, founder events, and adaptive potential. Small populations may speciate rapidly due to stronger drift, whereas large populations harbor more genetic diversity, which can alter divergence trajectories. We highlight theoretical models that incorporate population size
Ryo Yamaguchi, Hidaka Kubo, Tokuya Ogawa, Hayate Omura   +3 more
wiley   +1 more source

Pattern Avoidance in Poset Permutations

, 2015
We extend the concept of pattern avoidance in permutations on a totally ordered set to pattern avoidance in permutations on partially ordered sets. The number of permutations on $P$ that avoid the pattern $\pi$ is denoted $Av_P(\pi)$.
A Godbole, C Krattenthaler, C Savage, D Richards, DE Knuth, DE Knuth, GR Brightwell, J Bloom, M Bóna, M Klazar, MD Atkinson, MH Albert, Morgan Weiler, N Alon, P Brändén, R Simion, S Elizalde, S Heubach, S Kitaev, Sam Hopkins   +19 more
core   +1 more source

Graphical partially ordered sets

Discrete Applied Mathematics, 1987
The main results of this paper can be found in a generalization of reconstruction properties to a large class of combinatorial structures by a concept of g-graph. For example in the section 3, the author shows many results about the reconstruction conjecture: many of them are known for graphs, but author's proof generalizes them for digraphs ...
openaire   +3 more sources

Evolutionary interplay between viruses and R‐loops

FEBS Letters, EarlyView.
Viruses interact with specialized nucleic acid structures called R‐loops to influence host transcription, epigenetic states, latency, and immune evasion. This Perspective examines the roles of R‐loops in viral replication, integration, and silencing, and how viruses co‐opt or avoid these structures.
Zsolt Karányi, Zita Képes, Zoltán Szabó, Eszter Csoma, Lóránt Székvölgyi   +4 more
wiley   +1 more source

Actions of a separately strict cpo-monoid on pointed directed complete posets [PDF]

Categories and General Algebraic Structures with Applications, 2015
‎ In the present article‎, ‎we study some categorical properties of the category {$bf‎ Cpo_{Sep}$-$S$} of all {separately strict $S$-cpo's}; cpo's equipped with‎ a compatible right action of a separately strict cpo-monoid $S$ which is‎ strict continuous ...
Halimeh Moghbeli Damaneh
doaj  

Chromatic number of the product of graphs, graph homomorphisms, Antichains and cofinal subsets of posets without AC

, 2020
We have observations concerning the set theoretic strength of the following combinatorial statements without the axiom of choice. 1. If in a partially ordered set, all chains are finite and all antichains are countable, then the set is countable. 2.
Banerjee, Amitayu, Gyenis, Zalán
core  

Thermostable neutral metalloprotease from Geobacillus sp. EA1 does not share thermolysin's preference for substrates with leucine at the P1′ position

FEBS Letters, EarlyView.
Knowing how proteases recognise preferred substrates facilitates matching proteases to applications. The S1′ pocket of protease EA1 directs cleavage to the N‐terminal side of hydrophobic residues, particularly leucine. The S1′ pocket of thermolysin differs from EA's at only one position (leucine in place of phenylalanine), which decreases cleavage ...
Grant R. Broomfield, Torsten Kleffmann, David J. Saul, Sigurd M. Wilbanks   +3 more
wiley   +1 more source

Partially Ordered Group of the 2×2 Symmetric Matrices

InPrime, 2019
This paper deals with the partially ordered group of the 2×2 symmetric matrices. A matrix is defined to be a positive if each entry of the matrix is positive. With the characterization of the 2×2 symmetric matrix, we construct the positive cone such that
Irmatul Hasanah
doaj   +1 more source

A technique of tripled coincidence points for solving a system of nonlinear integral equations in POCML spaces

Journal of Inequalities and Applications, 2020
This manuscript aims to initiate some recent theoretical consequences related to tripled coincidence points for non-self mappings via the notion of C-type functions in partially ordered complete metric-like space (for short, POCML space).
Hasanen A. Hammad, Manuel De La Sen
doaj   +1 more source