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6,405 Results Found

  • Feature Paper
  • Article
  • Open Access
2,283 Views
12 Pages

3 August 2021

The interactions between topological covering spaces, homotopy and group structures in a fibered space exhibit an array of interesting properties. This paper proposes the formulation of finite covering space components of compact Lindelof variety in...

  • Article
  • Open Access
1 Citations
3,385 Views
9 Pages

26 January 2022

This paper describes a digital application designed for learning Space Groups of Symmetry (SGS). It teaches how to recognize the operations performed by the symmetry elements, both point (or 2D) operators (proper and improper rotations, including mir...

  • Article
  • Open Access
1 Citations
2,615 Views
14 Pages

18 March 2021

The algebraic as well as geometric topological constructions of manifold embeddings and homotopy offer interesting insights about spaces and symmetry. This paper proposes the construction of 2-quasinormed variants of locally dense p-normed 2-spheres...

  • Article
  • Open Access
14 Citations
8,443 Views
22 Pages

9 September 2023

Green spaces have been recognised for their positive impact on residents’ health and well-being. However, equitable access to these spaces remains a concern as certain social groups face barriers to reaching public green areas (PGS). Existing s...

  • Article
  • Open Access
90 Citations
13,736 Views
32 Pages

23 August 2022

Chirality depends on particular symmetries. For crystal structures it describes the absence of mirror planes and inversion centers, and in addition to translations, only rotations are allowed as symmetry elements. However, chiral space groups have ad...

  • Article
  • Open Access
653 Views
13 Pages

Trivial Homology Groups of Warped Product Semi-Slant Submanifolds in Kenmotsu Space Forms

  • Noura M. Alhouiti,
  • Ali H. Alkhaldi,
  • Akram Ali,
  • Fatemah Mofarreh and
  • Piscoran Laurian-Ioan

13 March 2025

This paper investigates the relationship between homology groups and warped product semi-slant submanifolds in Kenmotsu space forms. Some rigidity theorems for vanishing homology groups on warped product semi-slant submanifolds are obtained using the...

  • Article
  • Open Access
6 Citations
2,476 Views
23 Pages

6 July 2024

Social equity/inequity and equal/unequal rights to the city extend beyond the distribution of urban parks and green spaces, necessitating research on equitable accessibility to encompass a broader range of public spaces. However, previous research ha...

  • Review
  • Open Access
11 Citations
4,761 Views
40 Pages

Groups, Special Functions and Rigged Hilbert Spaces

  • Enrico Celeghini,
  • Manuel Gadella and
  • Mariano A. del Olmo

27 July 2019

We show that Lie groups and their respective algebras, special functions and rigged Hilbert spaces are complementary concepts that coexist together in a common framework and that they are aspects of the same mathematical reality. Special functions se...

  • Article
  • Open Access
5 Citations
2,495 Views
16 Pages

Influence of Pile Spacing on the Compressive Bearing Performance of CEP Groups

  • Yongmei Qian,
  • Qingzhi Cao,
  • Yang Yang,
  • Da Teng and
  • Tingting Zhou

Pile spacing is an important factor affecting the bearing capacity of concrete expansion pile (CEP) groups. In this study, a pile group was simulated and analyzed using ANSYS software R19.0. The influence of pile spacing on the bearing capacity of th...

  • Article
  • Open Access
1,698 Views
8 Pages

26 September 2022

In this paper, we characterize spaces of L∞-functions on a compact Hausdorff space that are invariant under a transitive and continuous group action. This work is analogous to established results concerning invariant spaces of continuous and me...

  • Article
  • Open Access
1 Citations
3,912 Views
9 Pages

12 July 2020

Topological photonics have developed in recent years since the seminal discoveries of topological insulators in condensed matter physics for electrons. Among the numerous studies, photonic Weyl nodes have been studied very recently due to their intri...

  • Review
  • Open Access
19 Citations
4,244 Views
11 Pages

19 October 2018

The entropy of Boltzmann-Gibbs, as proved by Shannon and Khinchin, is based on four axioms, where the fourth one concerns additivity. The group theoretic entropies make use of formal group theory to replace this axiom with a more general composabilit...

  • Article
  • Open Access
745 Views
16 Pages

24 July 2025

Protein packing within crystal lattices plays a critical role in determining molecular flexibility; therefore, the observed conformation and flexibility of protein side chains can vary depending on the crystal space group. Protein crystal dehydration...

  • Article
  • Open Access
1 Citations
830 Views
13 Pages

Effect of Pile Spacing on Load Bearing Performance of NT-CEP Pile Group Foundation

  • Yongmei Qian,
  • Hualong Li,
  • Wei Tian,
  • Hang Yu,
  • Yingtao Zhang,
  • Ming Guan and
  • Zhongwei Ma

22 April 2025

The NT-CEP pile is an innovative type of pile that builds upon the conventional concrete straight-hole cast-in-place pile. It primarily consists of two components: the main pile and the bearing plate. The key factors influencing its load-bearing capa...

  • Article
  • Open Access
3,212 Views
17 Pages

17 August 2022

We present schemes for simulating Brownian bridges on complete and connected Lie groups and homogeneous spaces. We use this to construct an estimation scheme for recovering an unknown left- or right-invariant Riemannian metric on the Lie group from s...

  • Article
  • Open Access
1,016 Views
22 Pages

11 August 2025

Human personality (HP) is seen as an individual’s consistent patterns of feeling, thinking, and behaving by today’s psychological studies, in which HPs are characterized in terms of traits—in particular, as relatively enduring chara...

  • Article
  • Open Access
9 Citations
2,586 Views
14 Pages

Null Homology Groups and Stable Currents in Warped Product Submanifolds of Euclidean Spaces

  • Yanlin Li,
  • Pişcoran Laurian-Ioan,
  • Akram Ali and
  • Ali H. Alkhaldi

28 August 2021

In this paper, we prove that, for compact warped product submanifolds Mn in an Euclidean space En+k, there are no stable p-currents, homology groups are vanishing, and M3 is homotopic to the Euclidean sphere S3 under various extrinsic restrictions, i...

  • Article
  • Open Access
3 Citations
1,985 Views
6 Pages

29 December 2021

Binary high temperature “Al3Mn” (T-phase) and its extensions in ternary systems were the subjects of numerous crystallographic investigations. The results were ambiguous regarding the existence or lack of the center of symmetry: both Pna2...

  • Article
  • Open Access
1,254 Views
18 Pages

The spacing between piles plays a crucial role in determining the load-bearing capacity of CEP group pile foundations equipped with a bearing platform. In this research, five sets of six-pile models with different pile spacings were created using ANS...

  • Article
  • Open Access
2 Citations
1,931 Views
15 Pages

24 May 2024

With this report, the space group of [Zn(Nal)(DACH)2]Cl is corrected (Nal: nalidixic acid mono-anion; DACH: diaminocyclohexane) from its wrong description in the literature. In the correct, non-centrosymmetric space group P1, the crystal structure is...

  • Article
  • Open Access
2 Citations
3,024 Views
12 Pages

Magnetic Structure of Inorganic–Organic Hybrid (C6H5CH2CH2NH3)2MnCl4 Using Magnetic Space Group Concept

  • Garam Park,
  • In-Hwan Oh,
  • J. M. Sungil Park,
  • Seungsoo Hahn and
  • Seong-Hun Park

30 November 2020

Previously, we reported that inorganic–organic hybrid (C6H5CH2CH2NH3)2MnCl4 (Mn-PEA) is antiferromagnetic below 44 K by using magnetic susceptibility and neutron diffraction measurements. Generally, when an antiferromagnetic system is investiga...

  • Article
  • Open Access
712 Views
23 Pages

20 October 2025

Due to the interference of artifacts and the nonlinearity of electroencephalogram (EEG) signals, the extraction of representational features has become a challenge in EEG emotion recognition. In this work, we reduce the dimensionality of phase space...

  • Article
  • Open Access
15 Citations
2,224 Views
19 Pages

20 December 2024

Previous studies on measuring the accessibility and equity of park green spaces (PGSs) often overlook differences in walking speeds across age groups, which may lead to research results that deviate from actual conditions. This study expands the curr...

  • Article
  • Open Access
1,001 Views
26 Pages

24 June 2025

The Visegrád Group (V4), as China’s key economic and trade partner in Central and Eastern Europe, plays a pivotal role in enhancing the effectiveness of sustainable development within the China-Central and Eastern Europe cooperation (Chi...

  • Article
  • Open Access
9 Citations
2,761 Views
17 Pages

Time Allocation and the Activity-Space-Based Segregation of Different Income Groups: A Case Study of Nanjing

  • Hui Wang,
  • Mei-Po Kwan,
  • Mingxing Hu,
  • Junheng Qi,
  • Jiemin Zheng and
  • Bin Han

4 October 2022

Time allocation is closely related to life quality and is a potential indicator of urban space utilization and sociospatial differentiation. However, existing time allocation studies focus on how time is allocated to various activities but pay less a...

  • Article
  • Open Access
52 Citations
10,297 Views
15 Pages

Does the Health Impact of Exposure to Neighbourhood Green Space Differ between Population Groups? An Explorative Study in Four European Cities

  • Annemarie Ruijsbroek,
  • Mariël Droomers,
  • Hanneke Kruize,
  • Elise Van Kempen,
  • Christopher J. Gidlow,
  • Gemma Hurst,
  • Sandra Andrusaityte,
  • Mark J. Nieuwenhuijsen,
  • Jolanda Maas and
  • Peter P. Groenewegen
  • + 2 authors

It has been suggested that certain residents, such as those with a low socioeconomic status, the elderly, and women, may benefit more from the presence of neighbourhood green space than others. We tested this hypothesis for age, gender, educational l...

  • Article
  • Open Access
1,284 Views
28 Pages

20 November 2025

Urban green spaces, as vital land use components, play a crucial role in promoting public mental health and well-being. This study investigates the differential restorative benefits and stress relief pathways in urban green spaces for populations wit...

  • Article
  • Open Access
7 Citations
8,854 Views
11 Pages

23 May 2005

In the course of investigating structural modifications of the 3-,4-connected net known as the Pt3O4 structure-type (waserite), a novel 4-,8-connected structure-type was discovered. This lattice is generated by replacing the 3-connected trigonal plan...

  • Article
  • Open Access
4 Citations
8,489 Views
27 Pages

Non-Crystallographic Symmetry in Packing Spaces

  • Valery G. Rau,
  • Leonty A. Lomtev and
  • Tamara F. Rau

9 January 2013

In the following, isomorphism of an arbitrary finite group of symmetry, non-crystallographic symmetry (quaternion groups, Pauli matrices groups, and other abstract subgroups), in addition to the permutation group, are considered. Application of fini...

  • Article
  • Open Access
9 Citations
7,353 Views
15 Pages

Effect of Relative Stiffness of Pile and Soil on Pile Group Effect

  • Bo Liu,
  • Xiaomin Wang,
  • Chunhui Liu and
  • Jingchang Kong

Pile groups are designed to sustain complex loads in various engineering. During the design of a pile group, the obvious pile group effect should be considered for closely spaced pile groups. However, the group effect considered by different scholars...

  • Article
  • Open Access
16 Citations
6,665 Views
19 Pages

Pro-Lie Groups: A Survey with Open Problems

  • Karl H. Hofmann and
  • Sidney A. Morris

24 July 2015

A topological group is called a pro-Lie group if it is isomorphic to a closed subgroup of a product of finite-dimensional real Lie groups. This class of groups is closed under the formation of arbitrary products and closed subgroups and forms a compl...

  • Feature Paper
  • Article
  • Open Access
10 Citations
3,403 Views
22 Pages

25 January 2022

This paper is supposed to form a keystone towards a new and alternative approach to Fourier analysis over LCA (locally compact Abelian) groups G. In an earlier paper the author has already shown that one can introduce convolution and the Fourier&ndas...

  • Article
  • Open Access
8 Citations
5,268 Views
20 Pages

The Impact of Urbanization on Taxonomic Diversity and Functional Similarity among Butterfly Communities in Waterfront Green Spaces

  • Wenqiang Fang,
  • Xiaoqian Lin,
  • Ying Lin,
  • Shanjun Huang,
  • Jingkai Huang,
  • Shiyuan Fan,
  • Chengyu Ran,
  • Emily Dang,
  • Yuxin Lin and
  • Weicong Fu

31 October 2023

Urbanization has been shown to cause biodiversity loss. However, its effects on butterfly taxonomic and functional diversity still need to be studied, especially in urban waterfront green spaces where mechanisms of impact still need to be explored. W...

  • Article
  • Open Access
268 Views
18 Pages

28 November 2025

We construct the free group over a non-Archimedean fuzzy metric space (X,M,∧) in the sense of George and Veeramani where ∧ is the minimum t-norm. The two main tools used are the concept of a scheme (for every non-empty subset S of N of even c...

  • Article
  • Open Access
38 Citations
9,490 Views
20 Pages

31 August 2017

The improper layout of urban public parks leads to the difference between citizens sharing or not sharing this kind of public resource, particularly in the historical districts of mountainous cities in China. The purpose of this study is to explore t...

  • Feature Paper
  • Article
  • Open Access
3,166 Views
8 Pages

Bounded Sets in Topological Spaces

  • Cristina Bors,
  • María V. Ferrer and
  • Salvador Hernández

10 February 2022

Let G be a monoid that acts on a topological space X by homeomorphisms such that there is a point x0∈X with GU=X for each neighbourhood U of x0. A subset A of X is said to be G-bounded if for each neighbourhood U of x0 there is a finite subset F of G...

  • Article
  • Open Access
2 Citations
2,507 Views
13 Pages

21 June 2020

The fundamental groups and homotopy decompositions of algebraic topology have applications in systems involving symmetry breaking with topological excitations. The main aim of this paper is to analyze the properties of homotopy decompositions in quot...

  • Article
  • Open Access
1 Citations
1,899 Views
14 Pages

Artificial Neural Networks Using Quiver Representations of Finite Cyclic Groups

  • Lucky Cahya Wanditra,
  • Intan Muchtadi-Alamsyah and
  • Dellavitha Nasution

24 November 2023

In this paper, we propose using quiver representations as a tool for understanding artificial neural network algorithms. Specifically, we construct these algorithms by utilizing the group algebra of a finite cyclic group as vertices and convolution t...

  • Article
  • Open Access
13 Citations
7,255 Views
26 Pages

Entangled Harmonic Oscillators and Space-Time Entanglement

  • Sibel Başkal,
  • Young S. Kim and
  • Marilyn E. Noz

28 June 2016

The mathematical basis for the Gaussian entanglement is discussed in detail, as well as its implications in the internal space-time structure of relativistic extended particles. It is shown that the Gaussian entanglement shares the same set of mathem...

  • Article
  • Open Access
1 Citations
1,786 Views
14 Pages

8 May 2020

The continuous and injective embeddings of closed curves in Hausdorff topological spaces maintain isometry in subspaces generating components. An embedding of a circle group within a topological space creates isometric subspace with rotational symmet...

  • Article
  • Open Access
2,102 Views
16 Pages

21 October 2021

We show that the category of quantale-valued tolerance spaces is isomorphic to a category of quantale-valued convergence spaces. We define suitable quantale-valued closure functions and use them to characterize transitivity axioms. Furthermore, trans...

  • Article
  • Open Access
4 Citations
3,219 Views
21 Pages

Heisenberg–Weyl Groups and Generalized Hermite Functions

  • Enrico Celeghini,
  • Manuel Gadella and
  • Mariano A. del Olmo

12 June 2021

We introduce a multi-parameter family of bases in the Hilbert space L2(R) that are associated to a set of Hermite functions, which also serve as a basis for L2(R). The Hermite functions are eigenfunctions of the Fourier transform, a property that is,...

  • Article
  • Open Access
2 Citations
6,437 Views
17 Pages

8 June 2020

As a representation of Korea’s modern architecture, Kim Swoo Geun described the Space Group of Korea Building as an “enclosed but endless space”. The Space Group Building is currently Korea’s Registered Cultural Heritage No. 5...

  • Article
  • Open Access
5 Citations
3,043 Views
16 Pages

19 August 2023

The crystal structures of red and blue-black tin(II) oxide, SnO, have been determined for the first time by single-crystal X-ray diffraction. Blue-black SnO crystallizes in the tetragonal space group P4/nmm, representing a layer structure consisting...

  • Article
  • Open Access
2 Citations
2,077 Views
12 Pages

10 December 2020

A holomorphically fibred space generates locally trivial bundles with positive dimensional fibers. This paper proposes two varieties of fibrations (compact and non-compact) in the non-uniformly scalable quasinormed topological (C, R) space admitting...

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