Results 11 to 20 of about 344,090 (225)

Further investigations on certain star selection principles

Topology and its Applications, 2023
We consider certain star versions of the Menger, Hurewicz and Rothberger properties. Few important observations concerning these properties are presented, which have not been investigated in earlier works. A variety of investigations is performed using Alster covers and critical cardinalities $\mathfrak{d}$, $\mathfrak{b}$ and ${\sf cov}(\mathcal{M})$.
Debraj Chandra, Nur Alam
openaire   +3 more sources

Some star and strongly star selection principles

Topology and its Applications, 2019
Connections between star-Menger and strongly star-Menger are explored. For example with a specified topology, $2^{\omega_1}$ is a metacompact regular space that is not strongly star-Menger but, with $\mathfrak d>\omega_1$, is star-Menger. Rudin's $\clubsuit$ example of a hereditarily separable, first countable de Caux-type space is Dowker and strongly ...
Casas-de la Rosa, Javier, Garcia-Balan, Sergio A., Szeptycki, Paul J.   +2 more
  +7 more sources

Relationships between some selection principles and star selection principles

Topology and its Applications, 2022
Motivated by the definition of classical star selection principles, Cruz-Castillo, Ram rez-P ramo and Tenorio defined some selection principles and posed several questions about relationships between these notions and some of the classical star selection principles. The main goal of this paper is to answer the questions posed by these authors.
openaire   +2 more sources

Hurewicz and Hurewicz-type star selection principles for hit-and-miss topology

Filomat, 2023
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 ...
Ricardo Cruz-Castillo, Alejandro Ramírez-Páramo, Jesús Tenorio   +2 more
openaire   +1 more source

Some new star-selection principles in topology

Filomat, 2017
Summary: Motivated by the recent works of Kočinac who initiated investigation of star selection principles, we introduce and study some new types of star-selection principles. Also some open problems are posed.
Bal, Prasenjit, Bhowmik, Subrata
openaire   +2 more sources

Heartbeat stars and the ringing of tidal pulsations [PDF]

, 2015
With the advent of high precision photometry from satellites such as Kepler and CoRoT, a whole new layer of interesting and astounding astronomical objects has been revealed: heartbeat stars are an example of such objects. Heartbeat stars are eccen- tric
Ballot, J, Fuller, J, García, RA, Hambleton, K, Kurtz, DW, Prsa, A, Thompson (SU), S   +6 more
core   +2 more sources

Photometric redshifts for the CFHTLS T0004 Deep and Wide fields [PDF]

, 2008
We compute photometric redshifts based on the template-fitting method in the fourth public release of the Canada-France-Hawaii Telescope Legacy Survey. This unique multi-colour catalogue comprises u*,g',r',i',z' photometry in four deep fields of 1 deg2 ...
A. Zanichelli, Arnouts, Arnouts, B. Garilli, Ball, Benjamin, Benítez, Bergé, Bertin, Brodwin, Bruzual, Calzetti, Coleman, Davis, Davis, E. Bertin, E. Zucca, Erben, Fahlman, Feldmann, Fu, G. Zamorani, Garilli, H. Aussel, H. J. McCracken, Hildebrandt, Ilbert, Ilbert, Ilbert, J. Coupon, Kilbinger, Kinney, L. Guzzo, L. Tresse, Le Fèvre, Le Fèvre, Lilly, M. Bolzonella, M. Kilbinger, M. Schultheis, Magnier, Margoniner, McCracken, Mobasher, O. Ilbert, O. Le Fèvre, P. Hudelot, Parker, Pickles, Prevot, Rowan-Robinson, S. Arnouts, S. Bardelli, Schlegel, Schultheis, Szalay, Tereno, V. Le Brun, Van Waerbeke, Wolf, Y. Mellier   +60 more
core   +6 more sources

Declining Volatility, a General Property of Disparate Systems: From Fossils, to Stocks, to the Stars

, 2013
There may be structural principles pertaining to the general behavior of systems that lead to similarities in a variety of different contexts. Classic examples include the descriptive power of fractals, the importance of surface area to volume ...
ADRAIN, ANG, BAKER, BAMBACH, BENTON, BONNER, BRIGGS, BROMHAM, BROOKS, CERVANTES-COTA, CORNETTE, CUCCIATI, ELDREDGE, ELDREDGE, ELDREDGE, FELLER, FOOTE, GALILEO, GEHRELS, GILINSKY, GILINSKY, GOODMAN, GOULD, GOULD, GOULD, GOULD, GOULD, GOULD, GOULD, GOULD, JABLONSKI, JABLONSKI, JABLONSKI, JOHNSON, JUST, KARACESKI, KAUFMAN, KIRCHNER, KRUG, KURTÉN, LIEBERMAN, LIEBERMAN, LIEBERMAN, LIEBERMAN, LIEBERMAN, LILY, LINEWEAVER, LLOYD, LO, MacARTHUR, MADAU, MANDELBROT, McGOWAN, McSHEA, MELOTT, MELOTT, MELOTT, MILLER, MOSKOWITZ, NIKLAS, PATTERSON, PETERS, PETTINI, PLOTNICK, RAUP, RAUP, RAUP, SEPKOSKI, STANLEY, STANLEY, VRBA, VRBA, WILKINSON   +72 more
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Dusty Universe viewed by AKARI far infrared detector [PDF]

, 2013
We present the results of the analysis of multiwavelength Spectral Energy Distributions (SEDs) of far-infrared galaxies detected in the AKARI Deep Field-South (ADF--S) Survey.
Buat, V., Burgarella, D., Giovannoli, E., Kurek, A., Malek, K., Malkan, M., Pollo, A., Takeuchi, T. T.   +7 more
core   +3 more sources

Scouting the spectrum for interstellar travellers

, 2012
Advanced civilizations capable of interstellar travel, if they exist, are likely to have advanced propulsion methods. Spaceships moving at high speeds would leave a particular signature which could be detected from Earth. We propose a search based on the
Bernstein, Bracewell, Brown, Bussard, Cox, Dyson, Edmondson, Einstein, Forward, Freitas, Granatstein, Hinshaw, Hui, Juan Carlos Garcia-Escartin, Lagoute, Liebert, Long, Léger, Matloff, McKinley, McKinley, McKinley, Pasour, Pedro Chamorro-Posada, Pirozhkov, Sagan, Semyonov, Tarter, Turnbull, Turnbull, Vulpetti   +30 more
core   +1 more source