Results 21 to 30 of about 9,128,034 (234)

Aperiodicity, Star-freeness, and First-order Logic Definability of Operator Precedence Languages [PDF]

open access: yesLogical Methods in Computer Science, 2023
A classic result in formal language theory is the equivalence among non-counting, or aperiodic, regular languages, and languages defined through star-free regular expressions, or first-order logic.
Dino Mandrioli   +2 more
doaj   +1 more source

Group Theory of Syntactical Freedom in DNA Transcription and Genome Decoding

open access: yesCurrent Issues in Molecular Biology, 2022
Transcription factors (TFs) are proteins that recognize specific DNA fragments in order to decode the genome and ensure its optimal functioning. TFs work at the local and global scales by specifying cell type, cell growth and death, cell migration ...
Michel Planat   +5 more
doaj   +1 more source

The Curled Up Dimension in Quasicrystals

open access: yesCrystals, 2021
Most quasicrystals can be generated by the cut-and-project method from higher dimensional parent lattices. In doing so they lose the periodic order their parent lattice possess, replaced with aperiodic order, due to the irrationality of the projection ...
Fang Fang, Richard Clawson, Klee Irwin
doaj   +1 more source

Logical and Algebraic Characterizations of Rational Transductions [PDF]

open access: yesLogical Methods in Computer Science, 2019
Rational word languages can be defined by several equivalent means: finite state automata, rational expressions, finite congruences, or monadic second-order (MSO) logic.
Emmanuel Filiot   +2 more
doaj   +1 more source

A sufficient condition for stability of the calculation of parameters of aperiodic processes based on second order difference equations

open access: yesVestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2012
The stability problem for the calculation of parameters of the second order damping aperiodic processes is considered. The numerical method of the second order aperiodic process parameters determination, based on iterative procedure of difference equation
Vladimir E Zoteev
doaj   +3 more sources

Fractal and Statistical Phenomena in Aperiodic Order

open access: yes
In this work, we study (primitive) inflation systems arising from substitutions and tiling rules, in particular their statistical properties and several fractal phenomena appearing while describing them. We provide a careful analysis of one-dimensional unimodular Pisot substitutions and show a dichotomy result for their corresponding windows in model
Mazáč, Jan ; https://orcid.org/
openaire   +2 more sources

WHAT IS...Aperiodic Order?

open access: yesNotices of the American Mathematical Society, 2016
This article provides a brief introductory account of the theory of aperiodic order.
Baake, Michael   +2 more
openaire   +2 more sources

Broadband Mid-IR superabsorption with aperiodic polaritonic photonic crystals [PDF]

open access: yesJournal of the European Optical Society-Rapid Publications, 2014
We propose an approach for broadband near-perfect absorption with aperiodic-polaritonic photonic crystals (PCs) operating in the phonon-polariton gap of the constituent material.
Devarapu G. C. R., Foteinopoulou S.
doaj   +1 more source

Aperiodically Intermittent Control Strategy and Adaptive Synchronization of Neural Networks With Inertial and Memristive Terms

open access: yesIEEE Access, 2023
The problem of adaptive aperiodic intermittent synchronization scheme is studied for inertial memristive delayed neural networks by using a piecewise Lyapunov function in this article.
Mei Liu   +3 more
doaj   +1 more source

Hexagonal Inflation Tilings and Planar Monotiles [PDF]

open access: yes, 2012
Baake M, Gähler F, Grimm U. Hexagonal Inflation Tilings and Planar Monotiles. Symmetry. 2012;4(4):581-602.Aperiodic tilings with a small number of prototiles are of particular interest, both theoretically and for applications in crystallography.
Uwe Grimm   +6 more
core   +1 more source

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