Results 61 to 70 of about 3,484,215 (187)

Connectivity of complexes of separating curves

open access: yes, 2012
We prove that the separated curve complex of a closed orientable surface of genus g is (g-3)-connected. We also obtain a connectivity property for a separated curve complex of the open surface that is obtained by removing a finite set from a closed one ...
Looijenga, Eduard
core   +1 more source

On Nano πgb-Closed Sets

open access: yesJournal of New Theory, 2018
In this paper we introduce a new class of sets called nano πgb-closed sets and nano πgb-open sets. We study some of its basic properties.
İlangovan Rajasekaran, Ochanan Nethaji
doaj  

On a class of sets betweenμ-closed sets andμg-closed sets [PDF]

open access: yesJournal of Taibah University for Science, 2017
In this paper, a new class of sets called μ*g-closed sets are introduced and investigated with the help of μ-open and μg-open sets. Relationships between this new class and other related classes of sets are established. Some separation axioms has also being studied. Finally, some preservation theorems have been given.
Bishwambhar Roy, Ritu Sen
openaire   +2 more sources

Λg-CLOSED SETS IN IDEAL TOPOLOGICAL SPACES

open access: yesJournal of New Theory, 2015
− The notion of Λg-closed sets is introduced in ideal topological spaces. Characterizations and properties of IΛg-closed sets and IΛg-open sets are given. A characterization of normalspaces is given in terms of IΛg-open sets. Also, it is established that
Ochanathevar Ravi   +3 more
doaj  

ON NANO Λg-CLOSED SETS

open access: yesJournal of New Theory, 2017
Abstaract−In this paper, we introduce nano ∧g-closed sets in nano topological spaces. Some properties of nano ∧g-closed sets and nano ∧g-open sets are weaker forms of nano closed sets and nano open ...
İlangovan Rajasekaran, Ochanan Nethaji
doaj  

The Closed Orbit Controllability Criterium [PDF]

open access: yes, 2010
We prove that every closed "general" trajectory of the control system $\Sigma_M$ has an open neighborhood on which $\Sigma_M$ is controllable if 1) this orbit contains some point where the Lie algebra rank condition ($LARC$) is satisfied, and 2) the set ...
Marenitch, Valeri
core  

When Compact Sets are -Closed

open access: yesAl-Nahrain Journal of Science, 2018
This paper is devoted to introduce new concepts so called K( c)-space several various theorems about these concepts are provided In addition, further properties are studied such as the relationships between those concepts and other types of K( c)-spaces are investigated.
Haider Jebur Ali, Marwa Makki Dahham
openaire   +2 more sources

Mildly Ig-Closed Sets

open access: yesJournal of New Results in Science, 2014
called mildly Ig-open sets in ideal topological spaces is introducedand the notion of mildly Ig-closed sets in ideal topological spacesis studied.
O. Ravi, R.Senthil Kumarb
doaj  

Lattice of $E$-closed Classes of Multifunctions of Rank 2

open access: yesИзвестия Иркутского государственного университета: Серия "Математика"
Multifunctions are discrete functions defined on a finite set and returning as their values all subsets of the considered set. The paper considers the classification of multifunctions defined on a two-element set with respect to the E-closure operator ...
B. P. Ilyin, V.I. Panteleev
doaj   +1 more source

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