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Artigos de revistas sobre o tema "Star covering"

Autor: Grafiati

Publicado: 3 de junho de 2025

Última modificação: 31 de julho de 2025

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1

van Douwen, E. K., G. M. Reed, A. W. Roscoe, and I. J. Tree. "Star covering properties." Topology and its Applications 39, no. 1 (1991): 71–103. http://dx.doi.org/10.1016/0166-8641(91)90077-y.

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2

Song, Yan-Kui. "Remarks on star covering properties in pseudocompact spaces." Mathematica Bohemica 138, no. 2 (2013): 165–69. http://dx.doi.org/10.21136/mb.2013.143288.

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3

Song, Yan-Kui. "On countable star-covering properties." Applied General Topology 8, no. 2 (2007): 249–58. http://dx.doi.org/10.4995/agt.2007.1890.

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4

Alas, Ofelia T., Lucia R. Junqueira, and Richard G. Wilson. "Countability and star covering properties." Topology and its Applications 158, no. 4 (2011): 620–26. http://dx.doi.org/10.1016/j.topol.2010.12.012.

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5

Mukherjee, Anupam, Partha Sarathi Barma, Joydeep Dutta, Sujit Das, and Dragan Pamucar. "Imprecise covering ring star problem." Decision Making: Applications in Management and Engineering 6, no. 1 (2023): 303–20. http://dx.doi.org/10.31181/dmame0323062022s.

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In this paper, we formulate and solve an Imprecise Covering Ring Star Problem (ICRSP), which is a generalization of the Ring Star Problem (RSP). Here the objective of this problem is to find a subset of nodes in a network to minimize the sum of routing costs of interconnecting cycle and assignment costs of the nodes which are out of cycle, to their nearest concentrators such that no assigned node exceeds a predetermined distance (say, covering distance) from the concentrators. The covering distance, as well as the routing and assignments costs, are considered as fuzzy in the proposed ICRSP. A

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6

Kočinac, Ljubiša D. R., Şukran Konca, and Sumit Singh. "Set Star-Menger and Set Strongly Star-Menger Spaces." Mathematica Slovaca 72, no. 1 (2022): 185–96. http://dx.doi.org/10.1515/ms-2022-0013.

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Abstract Motivated by the Arhangel’skii “s-Lindelöf cardinal function” definition, Kočinac and Konca defined and studied set covering properties and set star covering properties. In this paper, we present results on the star covering properties called set star-Menger and set strongly star-Menger. We investigate the relationship among set star-Menger, set strongly star-Menger and other related properties and study the topological properties of set star-Menger and set strongly star-Menger properties.

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7

Song, Yankui. "Star covering properties in pseudocompact spaces." Topology and its Applications 159, no. 5 (2012): 1462–66. http://dx.doi.org/10.1016/j.topol.2012.01.006.

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8

Xuan, Wei-Feng, Yan-Kui Song, and Wei-Xue Shi. "Chain conditions and star covering properties." Topology and its Applications 255 (March 2019): 148–56. http://dx.doi.org/10.1016/j.topol.2019.01.009.

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9

Khan, Moiz ud Din, and Amani Sabah. "Selection principles and covering properties in bitopological spaces." Applied General Topology 21, no. 1 (2020): 159. http://dx.doi.org/10.4995/agt.2020.12238.

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<p>Our main focus in this paper is to introduce and study various selection principles in bitopological spaces. In particular, Menger type, and Hurewicz type covering properties like: Almost p-Menger, star p-Menger, strongly star p-Menger, weakly p-Hurewicz, almost p-Hurewicz, star p-Hurewicz and strongly star p-Hurewicz spaces are defined and corresponding properties are investigated. Relations between some of these spaces are established.</p>

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10

Cui, Xiang-xiang, Hong-li Wang, Jing-hui Lu, and Cong Chen. "Star Covering Region Evaluation with Application to Star Tracker Design." Journal of Aerospace Engineering 27, no. 2 (2014): 291–96. http://dx.doi.org/10.1061/(asce)as.1943-5525.0000259.

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11

Bonanzinga, Maddalena, Davide Giacopello, and Fortunato Maesano. "Some properties defined by relative versions of star-covering properties II." Applied General Topology 24, no. 2 (2023): 391–405. http://dx.doi.org/10.4995/agt.2023.17926.

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In this paper we consider some recent relative versions of Menger property called set strongly star Menger and set star Menger properties and the corresponding Hurewicz-type properties. In particular, using [2], we "easily" prove that the set strong star Menger and set strong star Hurewicz properties are between countable compactness and the property of having countable extent. Also we show that the extent of a regular set star Menger or a set star Hurewicz space cannot exceed c. Moreover, we construct (1) a consistent example of a set star Menger (set star Hurewicz) space which is not set str

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12

Ussipov, N. "FRACTAL DIMENSION OF STAR CLUSTERS." Eurasian Physical Technical Journal 21, no. 3(49) (2024): 108–16. http://dx.doi.org/10.31489/2024no3/108-116.

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Quantitative analysis of the structure of star clusters is crucial for understanding their formation and evolution. In this article, we explore the application of fractal dimension analysis to study the evolution of star clusters, also fractal dimension, a concept from fractal geometry, provides a quantitative measure of the complexity and self-similarity of geometric objects. By considering star clusters as complex networks, we employ the box covering method to calculate their fractal dimension. Our methodology combines the well-established Minimum Spanning Tree (MST) and Box-Covering (BC) me

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13

Cho, Myung-Hyun, and Jun-Hui Kim. "TOPOLOGICAL OPERATIONS OF ITERATED STAR-COVERING PROPERTIES." Bulletin of the Korean Mathematical Society 40, no. 4 (2003): 723–31. http://dx.doi.org/10.4134/bkms.2003.40.4.723.

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14

Song, Yankui. "Remarks on countability and star covering properties." Topology and its Applications 158, no. 9 (2011): 1121–23. http://dx.doi.org/10.1016/j.topol.2011.03.006.

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15

Mattiro, N., and I. W. Sudarsana. "Pelabelan Selimut Bintang Ajaib Super Pada Graf Bintang." JURNAL ILMIAH MATEMATIKA DAN TERAPAN 18, no. 1 (2021): 95–109. http://dx.doi.org/10.22487/2540766x.2021.v18.i1.15479.

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Let be a simple graph. An edge covering of is a family of subgraphs such that each edge of graph belongs to at least one of the , subgraphs. If each is isomorphic with the given graph , then it is said that contains a covering. The graph G contains a covering and the bijectif function is said an the magic labeling of a graph G if for each subgraph of is isomorphic to , so that is a constant. It is said that the graph G has a super magic if in this case, the graph G which can be labeled with magic is called the covering graph magic. A star graph with n points is a graph with points and sides, w

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16

Gewali, Laxmi, Mark Keil, and Simeon Ntafos. "On covering orthogonal polygons with star-shaped polygons." Information Sciences 65, no. 1-2 (1992): 45–63. http://dx.doi.org/10.1016/0020-0255(92)90077-l.

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17

Youngpeter, Christa. "Covering the Lone Star State ProFile: Matt Miller." CoatingsPro 18, no. 5 (2018): 72. https://doi.org/10.5006/cp2018_18_5-72.

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18

Bal, Prasenjit, Subrata Bhowmik, and David Gauld. "On Selectively Star-Lindelof Properties." Journal of the Indian Mathematical Society 85, no. 3-4 (2018): 291. http://dx.doi.org/10.18311/jims/2018/20145.

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In this paper a new covering notion, called <em>M-</em>star-Lindelof, is introduced and studied. This notion of covering arises from the selection hypothesis SS*<sub>D,fin</sub>(D, D). The stronger form SS*<sub>D,1</sub>(D, D) of the selection hypothesis SS*<sub>D,fin</sub>(D, D) will also be discussed. We then consider weaker versions of these properties involving iterations of the star operator.

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19

Goodwin, Simon P. "Star formation simulations: caveats." Proceedings of the International Astronomical Union 5, H15 (2009): 793. http://dx.doi.org/10.1017/s1743921310011713.

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AbstractStar formation is such a huge problem, covering such a large range of physical scales and involving so many physical processes, that the results of simulations should always be taken with care.

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20

Al-Qubati, AbdulGawad A. Q. "On Fuzzy Star Refinement of Open Covering and imensions of Fuzzy Topological Spaces." Journal of the faculty of Education 1, no. 5 (2023): 7–21. http://dx.doi.org/10.60037/edu.v1i5.1204.

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In this paper the concepts of star-refinement and strongly star-refinement of covering are extended to fuzzy topological space in the sense of Chang, basic theorem for covering dimension of normal fuzzy topological space is proved. Also, the small inductive dimension function is extended to fuzzy topological space, and some results for this inductive dimension in Chang’s space are obtained.

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21

Al-Qubati, AbdulGawad A. Q. "On Fuzzy Star Refinement of Open Covering and imensions of Fuzzy Topological Spaces." Journal of the faculty of Education 1, no. 5 (2023): 7–21. http://dx.doi.org/10.60037/edu.v1i5.1045.

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In this paper the concepts of star-refinement and strongly star-refinement of covering are extended to fuzzy topological space in the sense of Chang, basic theorem for covering dimension of normal fuzzy topological space is proved. Also, the small inductive dimension function is extended to fuzzy topological space, and some results for this inductive dimension in Chang’s space are obtained.

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22

Aiken, L. P. "Star-covering properties: Generalized Ψ-spaces, countability conditions, reflection". Topology and its Applications 158, № 13 (2011): 1732–37. http://dx.doi.org/10.1016/j.topol.2011.06.032.

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23

Sen, Ritu. "Unification of relative versions of some star-covering properties." Annals of the Alexandru Ioan Cuza University - Mathematics 69, no. 1 (2023): 77–93. http://dx.doi.org/10.47743/anstim.2023.00006.

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24

Lu, Qi, Jinhui Zhao, Lijing Liu, Zhongjun Liu, and Chunlei Wang. "Design and Experiment of a Soil-Covering and -Pressing Device for Planters." Agriculture 14, no. 7 (2024): 1040. http://dx.doi.org/10.3390/agriculture14071040.

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In response to the practical production challenges posed by the unreliable operation of the V-shaped squeezing soil-covering and -pressing device (VCP) for planters under clay soil conditions in Northeast China, incomplete seed furrow closure, and severe soil adhesion on pressing wheels, this study proposes a device with star-toothed concave discs for soil-covering and -pressing (STCP) with the aim of enhancing the soil-covering quality of planters. The main working principles of STCP were expounded, and its main structural and installation parameters were determined and designed. Based on bio

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25

Bal, Prasenjit, and Susmita Sarkar. "On Strongly Star g-Compactness of Topological Spaces." Tatra Mountains Mathematical Publications 85, no. 3 (2023): 89–100. http://dx.doi.org/10.2478/tmmp-2023-0026.

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Abstract In this paper, we introduce strongly star g-compactness as a topological covering property and compare its structure to other topological properties that have analogous structures. The characteristics of a strongly star g-compact subset and strongly star g-compact subspace are looked at. Finally, some finite intersection-like characteristics that will result in some situations akin to strongly star g-compactness are presented.

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26

SABETI, SAMIRA, AKRAM BANIHASHEMI DEHKORDI, and SAEED MOHAMMADIAN SEMNANI. "The Minimum Edge Covering Energy of a Graph." Kragujevac Journal of Mathematics 45, no. 6 (2021): 969–75. http://dx.doi.org/10.46793/kgjmat2106.969s.

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In this paper, we introduce a new kind of graph energy, the minimum edge covering energy, ECE(G). It depends both on the underlying graph G, and on its particular minimum edge covering CE. Upper and lower bounds for ECE(G) are established. The minimum edge covering energy and some of the coeﬃcients of the polynomial of well-known families of graphs like Star, Path and Cycle Graphs are computed

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27

LINGAS, ANDRZEJ, AGNIESZKA WASYLEWICZ, and PAWEŁ ŻYLIŃSKI. "LINEAR-TIME 3-APPROXIMATION ALGORITHM FOR THE r-STAR COVERING PROBLEM." International Journal of Computational Geometry & Applications 22, no. 02 (2012): 103–41. http://dx.doi.org/10.1142/s021819591250001x.

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The complexity status of the minimum r-star cover problem for orthogonal polygons had been open for many years, until 2004 when Ch. Worman and J. M. Keil proved it to be polynomially tractable (Polygon decomposition and the orthogonal art gallery problem, IJCGA 17(2) (2007), 105-138). However, since their algorithm has Õ(n17)-time complexity, where Õ(·) hides a polylogarithmic factor, and thus it is not practical, in this paper we present a linear-time 3-approximation algorithm. Our approach is based upon the novel partition of an orthogonal polygon into so-called o-star-shaped orthogonal poly

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28

Nichols-Fleming, Fiona, and Eric G. Blackman. "Determination of the star-spot covering fraction as a function of stellar age from observational data." Monthly Notices of the Royal Astronomical Society 491, no. 2 (2019): 2706–14. http://dx.doi.org/10.1093/mnras/stz3197.

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ABSTRACT The association of star-spots with magnetic fields leads to an expectation that quantities which correlate with magnetic field strength may also correlate with star-spot coverage. Since younger stars spin faster and are more magnetically active, assessing whether star-spot coverage correlates with shorter rotation periods and stellar youth tests these principles. Here, we analyse the star-spot covering fraction versus stellar age for M-, G-, K-, and F-type stars based on previously determined variability and rotation periods of over 30 000 Kepler main-sequence stars. We determine the

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29

Singh, Sumit, Brij Tyagi, and Manoj Bhardwaj. "An ideal version of the star-C-Hurewicz covering property." Filomat 33, no. 19 (2019): 6385–93. http://dx.doi.org/10.2298/fil1919385s.

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A space X is said to have the star-C-I-Hurewicz (SCIH) property if for each sequence (Un : n ? N) of open covers of X there is a sequence (Kn : n ? N) of countably compact subsets of X such that for each x ? X, {n ? N : x ? St(Kn,Un)} ? I, where I is a proper admissible ideal of N. We investigate the relationships among the SCIH and related properties. We study the topological properties of the SCIH property. This paper generalizes several results of [21, 24] to the larger class of spaces having the SCIH property. The star-C-I-Hurewicz game is introduced. It is shown that, in a paracompact Hau

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30

Bonanzinga, Maddalena, and Fortunato Maesano. "Some properties defined by relative versions of star-covering properties." Topology and its Applications 306 (February 2022): 107923. http://dx.doi.org/10.1016/j.topol.2021.107923.

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31

Marcelo D., Passos, Santana Heides L., and Silva Samuel G. da. "On star covering properties related to countable compactness and pseudocompactness." Commentationes Mathematicae Universitatis Carolinae 58, no. 3 (2017): 371–82. http://dx.doi.org/10.14712/1213-7243.2015.212.

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32

Tsaban, Boaz. "Combinatorial aspects of selective star covering properties in Ψ-spaces". Topology and its Applications 192 (вересень 2015): 198–207. http://dx.doi.org/10.1016/j.topol.2015.05.082.

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33

Motwani, Rajeev, Arvind Raghunathan, and Huzur Saran. "Covering orthogonal polygons with star polygons: The perfect graph approach." Journal of Computer and System Sciences 40, no. 1 (1990): 19–48. http://dx.doi.org/10.1016/0022-0000(90)90017-f.

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34

Lingas, Andrzej, Agnieszka Wasylewicz, and Paweł Żyliński. "Note on covering monotone orthogonal polygons with star-shaped polygons." Information Processing Letters 104, no. 6 (2007): 220–27. http://dx.doi.org/10.1016/j.ipl.2007.06.015.

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35

Neumayer, Nadine. "Nuclear Star Clusters Structure and Stellar Populations." Proceedings of the International Astronomical Union 10, H16 (2012): 262–64. http://dx.doi.org/10.1017/s1743921314005699.

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36

Hatzes, A. P., D. Mkrtichian, and A. Kanaan. "Radial Velocity Studies of roAp stars: Rotational Modulation in HR 1217." International Astronomical Union Colloquium 185 (2002): 300–301. http://dx.doi.org/10.1017/s0252921100016304.

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AbstractWe present the preliminary results of our analysis of the precise radial velocity (RV) measurements of the roAp star HR1217. We have obtained over 2000 spectra of this star (54 hours of coverage) covering a complete rotation period using the 2-d coude echelle spectrograph of the McDonald Observatory’s 2.7m telescope. Our RV data show rotational modulation in both the amplitude and phase of the pulsations. The broad-band (covering 110 Å) RV semi-amplitudes of the f2 mode (=2.65 mHz) varied in the range of 25 m s–1 to 200 m s–1.

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37

Kočinac, Ljubiša D. R., and Selma Özçağ. "More on Selective Covering Properties in Bitopological Spaces." Journal of Mathematics 2021 (April 13, 2021): 1–9. http://dx.doi.org/10.1155/2021/5558456.

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In this study, we continue our investigation of selective covering properties in bitopological spaces. We discuss their behaviour under certain kinds of mappings. We also introduce selective versions of the ccc property and the star-ccc property in bitopological spaces and give few of their relations with other selective properties. Also, we consider preservation of selective covering properties of bitopological spaces under some known relations in bitopological context.

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38

Cruz-Castillo, Ricardo, Alejandro Ramírez-Páramo, and Jesús Tenorio. "Hurewicz and Hurewicz-type star selection principles for hit-and-miss topology." Filomat 37, no. 4 (2023): 1143–53. http://dx.doi.org/10.2298/fil2304143c.

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In this paper we continue the study of the characterization of selection principles in the hyperspaces CL(X), K(X), F(X) and CS(X), endowed with the hit-and-miss topology, by using ??(?)-networks and c?(?)-covers of a topological space X. Specifically, we prove theorems which characterize the covering properties Hurewicz, strongly star Hurewicz, star Hurewicz and absolutely strongly star Hurewicz in these hyperspaces.

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39

Singh, Sumit, Brij Tyagi, and Manoj Bhardwaj. "The almost I-Hurewicz covering property." Filomat 35, no. 14 (2021): 4777–87. http://dx.doi.org/10.2298/fil2114777s.

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In this paper, we introduce the almost I-Hurewicz (AIH) property which is a simultaneous generalization of the I-Hurewicz (IH) (see [1, 5]) and the almost Hurewicz [23] properties. It is shown that the AIH property independent to the weakly I-Hurewicz (WIH) [6] property, where I is the proper admissible ideal ofN. It is shown that in a regular space, the AIH property implies the IH property hence the WIH property, but not in Urysohn space. In a similar way, we consider almost I?-set and the almost star-I-Hurewicz property (ASIH) and it is shown that the image of almost I?-set under ?-continuou

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40

Kathiresan, Kumarappan, and S. David Laurence. "On super (a,d)-antimagic total covering of star related graphs." Discussiones Mathematicae Graph Theory 35, no. 4 (2015): 755. http://dx.doi.org/10.7151/dmgt.1832.

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41

Hinrichs, Aicke. "Covering numbers, Vapnik–Červonenkis classes and bounds for the star-discrepancy." Journal of Complexity 20, no. 4 (2004): 477–83. http://dx.doi.org/10.1016/j.jco.2004.01.001.

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42

Maiolino, R., O. Shemmer, M. Imanishi, et al. "Dust covering factor, silicate emission, and star formation in luminous QSOs." Astronomy & Astrophysics 468, no. 3 (2007): 979–92. http://dx.doi.org/10.1051/0004-6361:20077252.

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43

Bonanzinga, Maddalena, and Davide Giacopello. "On some selective star Lindelöf-type properties." Mathematica Slovaca 75, no. 2 (2025): 469–81. https://doi.org/10.1515/ms-2025-0034.

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Abstract We investigate some properties recently studied by Cruz-Castillo, Ramı́rez-Páramo and Tenorio. These properties lie and behave in the middle ground between covering properties (in particular star corvering properties) and variations of separability. This dual perspective opens the door to numerous implications and connections among various known properties. In this paper, we present a few of them.

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44

SONG, YANKUI. "A PSEUDOCOMPACT TYCHONOFF SPACE THAT IS NOT STAR LINDELÖF." Bulletin of the Australian Mathematical Society 84, no. 3 (2011): 452–54. http://dx.doi.org/10.1017/s0004972711002413.

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AbstractLet P be a topological property. A space X is said to be star P if whenever 𝒰 is an open cover of X, there exists a subspace A⊆X with property P such that X=St(A,𝒰), where St(A,𝒰)=⋃ {U∈𝒰:U∩A≠0̸}. In this paper we construct an example of a pseudocompact Tychonoff space that is not star Lindelöf, which gives a negative answer to Alas et al. [‘Countability and star covering properties’, Topology Appl.158 (2011), 620–626, Question 3].

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45

Shepard, Mark. "Hospital Network Competition and Adverse Selection: Evidence from the Massachusetts Health Insurance Exchange." American Economic Review 112, no. 2 (2022): 578–615. http://dx.doi.org/10.1257/aer.20201453.

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Health insurers increasingly compete on their networks of medical providers. Using data from Massachusetts’s insurance exchange, I find substantial adverse selection against plans covering the most prestigious and expensive “star” hospitals. I highlight a theoretically distinct selection channel: consumers loyal to star hospitals incur high spending, conditional on their medical state, because they use these hospitals’ expensive care. This implies heterogeneity in consumers’ incremental costs of gaining access to star hospitals, posing a challenge for standard selection policies. Along with se

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46

Li, Jinjin, and Zhaowen Li. "A Positive Answer to Velichko's Question." gmj 13, no. 2 (2006): 291–96. http://dx.doi.org/10.1515/gmj.2006.291.

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Abstract We give positive answer to Velichko's question in which the quotient and 𝑠-map is replaced by a sequence-covering and 𝑐𝑠-map. In addition, let 𝑋 have a star-countable 𝑘-network, then 𝑋 is a sequence-covering and 𝑐𝑠-image of a locally separable metric space if and only if 𝑋 is a sequencecovering and 𝑐𝑠-image of a metric space.

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47

Bhardwaj, Manoj. "Star versions of Menger basis covering property and Menger measure zero spaces." Publicationes Mathematicae Debrecen 99, no. 3-4 (2021): 299–316. http://dx.doi.org/10.5486/pmd.2021.8835.

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48

Randall, Kate E., Andrew M. Hopkins, and Ray P. Norris. "Distinguishing Between AGN and Star-Forming Galaxies in ATLAS." Proceedings of the International Astronomical Union 5, S267 (2009): 133. http://dx.doi.org/10.1017/s1743921310005946.

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The Australia Telescope Large Area Survey (ATLAS; Norris et al. 2006) is the widest deep radio survey to date, covering approximately 7 square degrees over two fields, with extensive complementary data. We are investigating all possible discriminants between active galactic nuclei (AGN) and star-forming galaxies (SFG) in ATLAS, to determine a robust formula for distinguishing the two.

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Littlefair, S. P. "Angular momentum evolution of young stars." Proceedings of the International Astronomical Union 9, S302 (2013): 91–99. http://dx.doi.org/10.1017/s1743921314001793.

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AbstractIn recent years, rotation periods for large numbers of pre-main-sequence stars have become available, covering a wide range of ages and star forming environments. Simultaneously, theoretical developments in the physics of the star-disc interaction have been carried out, and observational measurements of the magnetic field geometry of both fully convective, and pre-main-sequence stars have become available. This review discusses these recent developments, and the extent to which the observational data fits within the existing theoretical frameworks.

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Andersson, N., and P. Pnigouras. "The phenomenology of dynamical neutron star tides." Monthly Notices of the Royal Astronomical Society 503, no. 1 (2021): 533–39. http://dx.doi.org/10.1093/mnras/stab371.

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ABSTRACT We introduce a phenomenological, physically motivated, model for the effective tidal deformability of a neutron star, adding the frequency dependence (associated with the star’s fundamental mode of oscillation) that comes into play during the late stages of the binary inspiral. Testing the model against alternative descriptions, we demonstrate that it provides an accurate representation of the dynamical tide up to close to merger. The simplicity of the prescription makes it an attractive alternative for a gravitational-wave data analysis implementation, facilitating an inexpensive con

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