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467 Results Found

  • Article
  • Open Access
5 Citations
4,208 Views
30 Pages

Optionality is an issue within the minimalist theory of language, in which the principle of the “last resort” does not admit competing options to express the same meaning. What is needed is a solid empirical base showing that apparently c...

(This article belongs to the Special Issue Variation and Optionality in Determiner Systems across the World Languages)
  • Article
  • Open Access
2 Citations
3,634 Views
22 Pages

22 September 2023

This paper is meant as a contribution to the research project on variation and optionality in the determiner system in Italo-Romance, with novel data from the Sicilian dialect of Delia. The study is based on fieldwork interviews and the construction...

(This article belongs to the Special Issue Variation and Optionality in Determiner Systems across the World Languages)
  • Article
  • Open Access
1 Citations
2,291 Views
15 Pages

7 February 2021

We study the semi-Riemannian geometry of the foliation F of an indefinite locally conformal Kähler (l.c.K.) manifold M, given by the Pfaffian equation ω=0, provided that ∇ω=0 and c=∥ω∥≠0 (ω is the Lee form of M). If M is conformally flat then every l...

(This article belongs to the Special Issue Differential Geometry: Theory and Applications)
  • Article
  • Open Access
1 Citations
2,611 Views
9 Pages

Indefinite Graphene Nanocavities with Ultra-Compressed Mode Volumes

  • Chunchao Wen,
  • Zongyang Wang,
  • Jipeng Xu,
  • Wei Xu and ,
  • Wei Liu,
  • Zhihong Zhu,
  • Jianfa Zhang and
  • Shiqiao Qin
  • + 3 authors+ 0 author

14 November 2022

Explorations of indefinite nanocavities have attracted surging interest in the past few years as such cavities enable light confinement to exceptionally small dimensions, relying on the hyperbolic dispersion of their consisting medium. Here, we propo...

(This article belongs to the Special Issue Synthesis, Modification and Application of Graphene)
  • Article
  • Open Access
1,873 Views
13 Pages

On an Indefinite Metric on a Four-Dimensional Riemannian Manifold

  • Dimitar Razpopov,
  • Georgi Dzhelepov and
  • Iva Dokuzova

27 April 2023

Our research focuses on the tangent space of a point on a four-dimensional Riemannian manifold. Besides having a positive definite metric, the manifold is endowed with an additional tensor structure of type (1,1), whose fourth power is minus the iden...

(This article belongs to the Special Issue Advances in Differential Geometry and Singularity Theory)
  • Article
  • Open Access
8 Citations
3,167 Views
26 Pages

20 November 2020

Quantum teleportation has had notorious advances in the last decade, being successfully deployed in the experimental domain. In other terrains, the understanding of indefinite causal order has demonstrated a valuable enhancement in quantum communicat...

(This article belongs to the Special Issue Symmetries in Quantum Mechanics)
  • Article
  • Open Access
3,825 Views
15 Pages

10 September 2018

We investigate recurrent, Lie-recurrent, and Hopf lightlike hypersurfaces of an indefinite trans-Sasakian manifold with a semi-symmetric metric connection. In these hypersurfaces, we obtain several new results. Moreover, we characterize that the tota...

(This article belongs to the Special Issue Applications of Differential Geometry)
  • Article
  • Open Access
365 Views
29 Pages

Proof-of-Principle Implementation of Quantum Key Distribution in an Indefinite Causal Order

  • Yann Valibouse,
  • Martí Cladera-Rosselló,
  • Michael Antesberger,
  • Hector Spencer-Wood and ,
  • Kyrylo Simonov,
  • Patrik I. Sund,
  • Mathieu Bozzio,
  • Philip Walther and
  • Lee A. Rozema
  • + 4 authors+ 0 author

18 October 2026

In quantum physics, the order in which different operations occur can be placed in superposition. The resulting processes have an indefinite causal order which is of fundamental interest and can be viewed as a novel quantum resource enabling new prot...

(This article belongs to the Special Issue Quantum Information—Dedicated to Professor Gilles Brassard on the Occasion of His 70th Birthday)
  • Article
  • Open Access
16 Citations
2,612 Views
13 Pages

Geometry of Indefinite Kenmotsu Manifolds as *η-Ricci-Yamabe Solitons

  • Abdul Haseeb,
  • Mohd Bilal,
  • Sudhakar K. Chaubey and
  • Mohammad Nazrul Islam Khan

7 September 2022

In this paper, we study the properties of ϵ-Kenmotsu manifolds if its metrics are *η-Ricci-Yamabe solitons. It is proven that an ϵ-Kenmotsu manifold endowed with a *η-Ricci-Yamabe soliton is η-Einstein. The necessary condition...

(This article belongs to the Section Geometry and Topology)
  • Article
  • Open Access
539 Views
20 Pages

12 February 2026

We investigate transversal and radical transversal lightlike submanifolds (TLSs) of indefinite golden statistical manifolds (IGSMs). Using the dual affine connections associated with statistical structures, we obtain decomposition formulas and derive...

(This article belongs to the Special Issue Advances in Differential Geometry and Its Applications, 2nd Edition)
  • Article
  • Open Access
490 Views
23 Pages

5 August 2026

We construct classes of indefinite integrals that involve exceptional orthogonal polynomials of Laguerre, Jacobi, or Hermite types. By means of a recently devised method, these integrals can be represented in closed form. As a byproduct, we obtain in...

(This article belongs to the Section C3: Real Analysis)
  • Article
  • Open Access
65 Citations
6,763 Views
19 Pages

Communication Enhancement through Quantum Coherent Control of N Channels in an Indefinite Causal-Order Scenario

  • Lorenzo M. Procopio,
  • Francisco Delgado,
  • Marco Enríquez,
  • Nadia Belabas and
  • Juan Ariel Levenson

18 October 2019

In quantum Shannon theory, transmission of information is enhanced by quantum features. Up to very recently, the trajectories of transmission remained fully classical. Recently, a new paradigm was proposed by playing quantum tricks on two completely...

(This article belongs to the Special Issue Quantum Information Revolution: Impact to Foundations)
  • Article
  • Open Access
5,534 Views
51 Pages

Negative Indefinite Constructions in Bantu: ‘Nobody’

  • Maud Devos,
  • Johan van der Auwera and
  • Rasmus Bernander

This paper presents a first typology of negative indefinites in Bantu languages. The lack of interest in expressions of ‘nobody’ in Bantu languages is connected with the idea that they merely involve a generic noun for ‘person&rsquo...

(This article belongs to the Special Issue Recent Developments on the Diachrony and Typology of Bantu Languages)
  • Article
  • Open Access
13 Citations
2,863 Views
27 Pages

14 March 2020

We consider nonlinear Robin problems driven by the p-Laplacian plus an indefinite potential. In the reaction, we have the competing effects of a parametric concave (that is, ( p − 1 ) -sublinear) term and of a convex (that is, ( p &m...

(This article belongs to the Section C1: Difference and Differential Equations)
  • Article
  • Open Access
5 Citations
4,753 Views
27 Pages

1 September 2022

Quantum Fisher Information is considered in Quantum Information literature as the main resource to determine a bound in the parametric characterization problem of a quantum channel by means of probe states. The parameters characterizing a quantum cha...

(This article belongs to the Special Issue Physics and Symmetry Section: Feature Papers 2022)
  • Article
  • Open Access
11 Citations
5,070 Views
22 Pages

24 May 2018

Extensions of the Kochen–Specker theorem use quantum logics whose classical interpretation suggests a true-implies-value indefiniteness property. This can be interpreted as an indication that any view of a quantum state beyond a single context...

(This article belongs to the Special Issue Quantum Foundations: 90 Years of Uncertainty)
  • Article
  • Open Access
11 Citations
3,909 Views
10 Pages

The Oxidation Behaviors of Indefinite Chill Roll and High Speed Steel Materials

  • Liang Hao,
  • Tuanjie Li,
  • Zhongliang Xie,
  • Qingjuan Duan and
  • Guoyuan Zhang

13 August 2020

Indefinite chill (IC) roll and high speed steel (HSS) materials have been widely employed to manufacture work rolls as latter and former stands in hot rolling mills. The oxidation of work rolls is of importance for the surface quality of the rolled w...

(This article belongs to the Special Issue Advances in Friction, Lubrication, Wear and Oxidation in Metals Manufacturing)
  • Article
  • Open Access
1,093 Views
23 Pages

24 December 2025

In Contemporary Portuguese, jamais ‘never’ is a negative indefinite that encodes temporal semantics and belongs to the set of strong Negative Polarity Items, being able to express negation on its own, in preverbal position. However, it or...

(This article belongs to the Special Issue Romance Historical Syntax: Special Issue on Syntactic Analyzability in Diachrony)
  • Article
  • Open Access
3 Citations
1,058 Views
30 Pages

27 January 2026

In this article, we present new theoretical findings on specific polynomials that generalize the concept of telephone numbers, namely, Telephone polynomials (TelPs). Several new formulas are developed, including expressions for higher-order derivativ...

(This article belongs to the Special Issue Recent Advances in Orthogonal Polynomials, Special Functions, and Their Applications)
  • Article
  • Open Access
1 Citations
1,597 Views
14 Pages

8 March 2025

This paper introduces the notion of screen generic lightlike submanifolds (SGLSs) of an indefinite Kaehler statistical manifold equipped with a quarter-symmetric non-metric (QSNM) connection, supported by suitable illustrations. Assertions for induce...

(This article belongs to the Special Issue Differential Geometry and Its Application, 3rd Edition)
  • Article
  • Open Access
927 Views
32 Pages

Quantum processes with indefinite causal order challenge the classical assumption that operations must occur in a single fixed temporal sequence. The quantum switch provides a concrete setting in which two operation orders, A≺B and B≺A, a...

(This article belongs to the Topic Quantum Computing: Latest Advances and Prospects)
  • Article
  • Open Access
4 Citations
3,007 Views
9 Pages

14 July 2022

High chromium and nickel indefinite chilled cast iron (ICCI), as an excellent hot roll material, is the preferred roll variety due to its good combination of surface roughness, hot crack resistance, and hot wear resistance. The microstructure and har...

(This article belongs to the Special Issue Structural Changes during Steel Processing)
  • Article
  • Open Access
2 Citations
12,187 Views
13 Pages

16 January 2019

The objective of this paper is to propose a mathematical interpretation of the continuous geometric proportion (Timaeus, 32a) with which Plato accomplishes the goal to unify, harmonically and symmetrically, the Two Opposite Elements of Timaeus Cosmos...

  • Article
  • Open Access
3,448 Views
13 Pages

In languages that have a definite article but no indefinite article, the definite article typically maps to definites, and the bare noun maps to indefinites. We investigate this mapping in Malagasy, which imposes an additional restriction: bare nouns...

(This article belongs to the Special Issue Variation and Optionality in Determiner Systems across the World Languages)
  • Feature Paper
  • Article
  • Open Access
4 Citations
2,013 Views
24 Pages

23 February 2025

In this paper, we investigate the interference engineering of the open quantum system, where the environment is made indefinite either through the use of an interferometer or the introduction of auxiliary qubits. The environments are modeled by fully...

(This article belongs to the Section Quantum Information)
  • Article
  • Open Access
2 Citations
4,011 Views
17 Pages

The development of the definite and indefinite articles in Castilian may be regarded as an instance of capitalization or adfunctionalization, following partial exaptation of the Latin demonstrative ille, which involves progressive widening without si...

(This article belongs to the Special Issue Studies in Historical Linguistics and Language Change. Grammaticalization, Refunctionalization and Beyond)
  • Article
  • Open Access
1 Citations
2,446 Views
18 Pages

Pareto Optimal Strategy under H∞ Constraint for Discrete-Time Stochastic Systems

  • Xiushan Jiang,
  • Qingti Pang,
  • Dongya Zhao and
  • Qingkang Zhang

11 July 2022

This paper investigates the Pareto optimal strategy of discrete-time stochastic systems under H∞ constraint, in which the weighting matrices of the weighted sum cost function can be indefinite. Combining the H∞ control theory with the ind...

(This article belongs to the Special Issue Advances in Nonlinear and Stochastic System Control)
  • Article
  • Open Access
6 Citations
4,362 Views
27 Pages

A Plural Indefinite Article in Heritage Greek: The Role of Register

  • Artemis Alexiadou,
  • Vasiliki Rizou and
  • Foteini Karkaletsou

This paper investigates the use of kati “some” by Greek Heritage Speakers (HSs) in comparison to monolinguals. While all Greek determiners are marked for gender, case, and number, and agree with their nominal complement, kati is an except...

(This article belongs to the Special Issue Variation and Optionality in Determiner Systems across the World Languages)
  • Article
  • Open Access
5 Citations
4,223 Views
8 Pages

19 November 2018

The phenomenon under discussion is an example of a grammatical change that can be explained by refunctionalization, and as such, can be understood as the acquisition of a new meaning by an ‘endangered’ grammatical construction, which is r...

(This article belongs to the Special Issue Studies in Historical Linguistics and Language Change. Grammaticalization, Refunctionalization and Beyond)
  • Article
  • Open Access
3,177 Views
27 Pages

The new approach to quantum mechanics (QM) is that the mathematics of QM is the linearization of the mathematics of partitions (or equivalence relations) on a set. This paper develops those ideas using vector spaces over the field Z2={0.1} as a pedag...

  • Article
  • Open Access
4 Citations
5,518 Views
21 Pages

In this article I explore how typological approaches can be used to construct novel classification schemes for Arabic dialects, taking the example of definiteness as a case study. Definiteness in Arabic has traditionally been envisioned as an essenti...

(This article belongs to the Special Issue The Classification of Arabic Dialects: Traditional Approaches, New Proposals, and Methodological Problems)
  • Review
  • Open Access
1,043 Views
47 Pages

A Survey of Lattice-Based Physical-Layer Security for Wireless Systems with p-Modular Lattice Constructions

  • Hassan Khodaiemehr,
  • Khadijeh Bagheri,
  • Amin Mohajer,
  • Chen Feng and ,
  • Daniel Panario and
  • Victor C. M. Leung
  • + 1 author+ 0 author

18 February 2026

Physical-layer security (PLS) provides an information-theoretic framework for securing wireless communications by exploiting channel and signal-structure asymmetries, thereby avoiding reliance on computational hardness assumptions. Within this settin...

(This article belongs to the Special Issue Wireless Communications: Signal Processing Perspectives, 2nd Edition)
  • Article
  • Open Access
2 Citations
3,187 Views
16 Pages

25 September 2023

Whether non-case-marked objects with and without the numeral bir in Turkish have the same structural properties or not has been a topic of discussion for decades. This study aims to contribute to this discussion with experimental data that compares t...

(This article belongs to the Special Issue Theoretical Studies on Turkic Languages)
  • Article
  • Open Access
481 Views
40 Pages

1 August 2026

Using an integral method based on indefinite integrals J±, we will give new numerical methods for tackling a variety of initial value problems. Within the scope of this study, a number of example cases of stiff and non-stiff initial value prob...

(This article belongs to the Special Issue Applications in Functional Analysis)
  • Article
  • Open Access
6 Citations
8,141 Views
48 Pages

Negative Concord without Agree: Insights from German, Dutch and English Child Language

  • Imke Driemel,
  • Johannes Hein,
  • Cory Bill,
  • Aurore Gonzalez and ,
  • Ivona Ilić,
  • Paloma Jeretič and
  • Astrid van Alem
  • + 2 authors+ 0 author

Children acquiring a non-negative concord language like English or German have been found to consistently interpret sentences with two negative elements in a negative concord manner as conveying a single semantic negation. Corpus-based investigations...

(This article belongs to the Special Issue Errors of Commission in Child Language)
  • Article
  • Open Access
3 Citations
5,261 Views
29 Pages

15 February 2024

The new logic of partitions is dual to the usual Boolean logic of subsets (usually presented only in the special case of the logic of propositions) in the sense that partitions and subsets are category-theoretic duals. The new information measure of...

(This article belongs to the Special Issue Information-Theoretic Concepts in Physics)
  • Article
  • Open Access
3 Citations
2,574 Views
22 Pages

10 February 2024

In recent years, many works have explored possible advantages of indefinite causal order, with the main focus on its controlled implementation known as quantum switch. In this paper, we tackle advantages in quantum thermodynamics, studying whether qu...

(This article belongs to the Special Issue Advances in Quantum Thermodynamics)
  • Article
  • Open Access
29 Citations
8,247 Views
16 Pages

7 December 2018

The Born postulate can be reduced to its deterministic content that only applies to eigenvectors of observables: The standard probabilistic interpretation of generic states then follows from algebraic properties of repeated measurements and states. E...

(This article belongs to the Section Atomic Physics)
  • Article
  • Open Access
6 Citations
4,506 Views
30 Pages

There is a fundamental subsets–partitions duality that runs through the exact sciences. In more concrete terms, it is the duality between elements of a subset and the distinctions of a partition. In more abstract terms, it is the reverse-the-ar...

(This article belongs to the Section Physical Sciences)
  • Article
  • Open Access
2 Citations
2,333 Views
23 Pages

11 June 2025

Quantum information transmission is subject to imperfections in communication processes and systems. These phenomena alter the original content due to decoherence and noise. However, suitable communication architectures incorporating quantum and clas...

(This article belongs to the Section Information and Communications Technology)
  • Article
  • Open Access
5 Citations
2,020 Views
16 Pages

Optimized Statistical Beamforming for Cooperative Spectrum Sensing in Cognitive Radio Networks

  • Ubaid M. Al-Saggaf,
  • Jawwad Ahmad,
  • Mohammed A. Alrefaei and
  • Muhammad Moinuddin

16 August 2023

In cognitive radio (CR), cooperative spectrum sensing (CSS) employs a fusion of multiple decisions from various secondary user (SU) nodes at a central fusion center (FC) to detect spectral holes not utilized by the primary user (PU). The energy detec...

(This article belongs to the Section E2: Control Theory and Mechanics)
  • Feature Paper
  • Article
  • Open Access
590 Views
34 Pages

24 March 2026

Addition theorems have been indispensable tools for the reduction of quantum transition amplitudes. They are normally utilized at the start of the process to move the angular dependence within plane waves, Coulomb potentials, and the like, into a sum...

  • Article
  • Open Access
3 Citations
1,936 Views
11 Pages

17 November 2022

Advances in higher-end spectrum utilization has enabled user equipment to dock multiple antenna elements, and hence make use of selectivity via equalization in new generation of mobile networks. The equalization can exploit channel statistics to shap...

(This article belongs to the Special Issue Complexity in 6G: Measures, Advanced Models and Mathematical Algorithms to Face New Challenges in the New Communication Paradigm Development)
  • Article
  • Open Access
2 Citations
2,829 Views
28 Pages

16 January 2023

Different hypotheses of carcinogenesis have been proposed based on local genetic factors and physiologic mechanisms. It is assumed that changes in the metric invariants of a biologic system (BS) determine the general mechanisms of cancer development....

  • Article
  • Open Access
1 Citations
942 Views
19 Pages

14 June 2025

This paper undertakes a detailed study of η-Ricci–Bourguignon solitons on ϵ-Kenmotsu manifolds, with particular focus on three special types of Ricci tensors: Codazzi-type, cyclic parallel and cyclic η-recurrent tensors that suppo...

(This article belongs to the Special Issue New Trends in Differential Geometry and Geometric Analysis)
  • Article
  • Open Access
3 Citations
428 Views
53 Pages

24 August 2026

Why do the laws represented by the Standard Model and general relativity have their observed forms, and why do their particular symmetry groups and numerical inputs occur? The reconstruction program proposes that these structures arise from a premetr...

(This article belongs to the Section C: Physics)
  • Article
  • Open Access
2 Citations
1,743 Views
19 Pages

28 February 2025

This paper describes a Krylov subspace iterative method designed for solving linear systems of equations with a large, symmetric, nonsingular, and indefinite matrix. This method is tailored to enable the evaluation of error estimates for the computed...

(This article belongs to the Special Issue Orthogonal Polynomials, Special Functions and Applications: 2nd Edition)
  • Article
  • Open Access
1 Citations
2,455 Views
29 Pages

5 January 2024

Quantum Parameter Estimation (QPE) is commonly led using quantum probe states for the characterization of quantum systems. For these purposes, Quantum Fisher Information (QFI) plays a crucial role by imposing a lower bound for the parametric estimati...

  • Article
  • Open Access
4 Citations
2,596 Views
24 Pages

16 May 2023

Parameter estimation for devices containing or supporting quantum systems is a field of quantum metrology using quantum probe states to reach their characterization. Pauli channels are ideal structures where qubits are transmitted or contained, commo...

(This article belongs to the Section C: Physics)
  • Article
  • Open Access
3 Citations
2,879 Views
26 Pages

16 November 2021

In this paper, we study the indefinite linear-quadratic (LQ) stochastic optimal control problem for stochastic differential equations (SDEs) with jump diffusions and random coefficients driven by both the Brownian motion and the (compensated) Poisson...

(This article belongs to the Section C1: Difference and Differential Equations)

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