Results 41 to 50 of about 1,461,044 (179)
Concircular vector fields for Kantowski Sachs and Bianchi type III spacetimes
, 2017 This paper intends to obtain concircular vector fields of Kantowski Sachs and Bianch type III spacetimes. For this purpose, ten conformal Killing equations and their general solution in the form of conformal Killing vector fields are derived along with ...
Ali, Ahmad T +2 more
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Estimation of smooth vector fields on manifolds by optimization on Stiefel group
Учёные записки Казанского университета: Серия Физико-математические науки, 2018 Real data are usually characterized by high dimensionality. However, real data obtained from real sources, due to the presence of various dependencies between data points and limitations on their possible values, form, as a rule, form a small part of the
E.N. Abramov, Yu.A. Yanovich
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Geometry of conformal vector fields
Arab Journal of Mathematical Sciences, 2017 It is well known that the Euclidean space (Rn,〈,〉), the n-sphere Sn(c) of constant curvature c and Euclidean complex space form (Cn,J,〈,〉) are examples of spaces admitting conformal vector fields and therefore conformal vector fields are used in ...
Sharief Deshmukh
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Invariant vector fields and groupoids
, 2014 We use the notion of isomorphism between two invariant vector fields to shed new light on the issue of linearization of an invariant vector field near a relative equilibrium.
Lerman, Eugene
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Ray Transforms and Vector Fields [PDF]
, 2011 We review and extend a technique for recovering a smooth function from its averages over a wide class of curves in a general region of Euclidean space.
Hoell, Nicholas
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Vector Fields on Quantum Groups
, 1995 We construct the space of vector fields on a generic quantum group. Its elements are products of elements of the quantum group itself with left invariant vector fields.
Aschieri, Paolo, Schupp, Peter
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Bounded Polynomial Vector Fields [PDF]
Transactions of the American Mathematical Society, 1990 We prove that, for generic bounded polynomial vector fields in R n {{\mathbf {R}}^n} with isolated critical points, the sum of the indices at all their critical points is ( − 1 ) n {( - 1 ...
Cima, Anna, Llibre, Jaume
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Orbital Reversibility of Planar Vector Fields
Mathematics, 2020 In this work we use the normal form theory to establish an algorithm to determine if a planar vector field is orbitally reversible. In previous works only algorithms to determine the reversibility and conjugate reversibility have been given.
Antonio Algaba +2 more
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The biharmonic homotopy problem for unit vector fields on 2-tori
, 2018 The bienergy of smooth maps between Riemannian manifolds, when restricted to unit vector fields, yields two different variational problems depending on whether one takes the full functional or just the vertical contribution. Their critical points, called
Loubeau, E., Markellos, M.
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Global Stability of Dynamic Systems of High Order
Symmetry, Integrability and Geometry: Methods and Applications, 2007 This paper deals with global asymptotic stability of prolongations of flows induced by specific vector fields and their prolongations. The method used is based on various estimates of the flows.
Mohammed Benalili, Azzedine Lansari
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