Results 141 to 150 of about 912,665 (314)

An Extension of Semicommutative Rings via Reflexivity [PDF]

open access: yesarXiv
This article introduces the notion of an NJ-reflexive ring and demonstrates that it is distinct from the concept of a reflexive ring. The class of NJ-reflexive rings contains the class of semicommutative rings, the class of left (right) quasi-duo rings, and the class of J-clean rings but is strictly larger than these classes.
arxiv  

QCSP on partially reflexive forests [PDF]

open access: yesarXiv, 2011
We study the (non-uniform) quantified constraint satisfaction problem QCSP(H) as H ranges over partially reflexive forests. We obtain a complexity-theoretic dichotomy: QCSP(H) is either in NL or is NP-hard. The separating condition is related firstly to connectivity, and thereafter to accessibility from all vertices of H to connected reflexive ...
arxiv  

Reflexive functors of modules in Commutative Algebra [PDF]

open access: yesarXiv, 2012
Reflexive functors of modules naturally appear in Algebraic Geometry, mainly in the theory of linear representations of group schemes, and in "duality theories". In this paper we study and determine reflexive functors and we give many properties of reflexive functors.
arxiv  

Algebraic Reflexivity of the set of n-Isometries on C(X,E) [PDF]

open access: yesarXiv, 2012
We prove that if the group of isometries of C(X,E) is algebraically reflexive, then the group of n-isometries is also algebraically reflexive. Here, X is a compact Hausdorff space and E is a Banach space. As a corollary to this, we establish the algebraic reflexivity of the set of generalized bi-circular projections on C(X,E).
arxiv  

Star-planet interactions. IV. Possibility of detecting the orbit-shrinking of a planet around a red giant

open access: yes, 2017
The surface rotations of some red giants are so fast that they must have been spun up by tidal interaction with a close companion, either another star, a brown dwarf, or a planet.
Alibert, Yann   +6 more
core   +1 more source

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