Results 41 to 50 of about 229 (132)
Subelliptic equations : control, singularities and spectral theory
, 2021 Dans cette thèse à la frontière entre analyse et géométrie, nous étudions des équations aux dérivées partielles (EDPs) sous-elliptiques en utilisant des outils récents de géométrie sous-Riemannienne et d'analyse microlocale. Nous étudions tout d'abord la contrôlabilité et l'observabilité d'EDPs sous-elliptiques, en montrant que plus une direction ...
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Papers in Palaeontology, Volume 12, Issue 1, January/February 2026.Abstract We describe the Hettangian Caenogastropoda and Heterobranchia of the Luxembourg Sandstone Formation, a wedge of clastic sediments deposited along the eastern margin of Paris Basin during the Early Jurassic. Five new genera and 11 new species are erected: Bourguetia bipartita sp. nov., Globularia delsatei sp. nov., Oonia feidtorum sp.
Stefano Monari +3 more
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Herz‐Type Hardy Spaces Associated with Operators
Journal of Function Spaces, Volume 2018, Issue 1, 2018., 2018 Suppose L is a nonnegative, self‐adjoint differential operator. In this paper, we introduce the Herz‐type Hardy spaces associated with operator L. Then, similar to the atomic and molecular decompositions of classical Herz‐type Hardy spaces and the Hardy space associated with operators, we prove the atomic and molecular decompositions of the Herz‐type ...
Yan Chai +3 more
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Papers in Palaeontology, Volume 10, Issue 4, July/August 2024.Abstract We describe a high‐diversity silicified assemblage of marine molluscs (Pelsa‐Vazzoler Lagerstätte) from the upper Ladinian of the Agordo Dolomites (northeastern Italy). New data on the Triassic rebound, after the end‐Permian mass extinction, constrain it to an interval of relatively stable climatic conditions.
Stefano Dominici +2 more
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Estimates on the Bergman Kernels in a Tangential Direction on Pseudoconvex Domains in C3
Abstract and Applied Analysis, Volume 2018, Issue 1, 2018., 2018 Let Ω be a smoothly bounded pseudoconvex domain in C3 and assume that TΩreg(z0)<∞ where z0 ∈ bΩ, the boundary of Ω. Then we get optimal estimates of the Bergman kernel function along some “almost tangential curve” Cb(z0, δ0) ⊂ Ω ∪ {z0}.
Sanghyun Cho, Milan Pokorny
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Closed 3‐forms in five dimensions and embedding problems
Journal of the London Mathematical Society, Volume 109, Issue 4, April 2024.Abstract We consider the question if a five‐dimensional manifold can be embedded into a Calabi–Yau manifold of complex dimension 3 such that the real part of the holomorphic volume form induces a given closed 3‐form on the 5‐manifold. We define an open set of 3‐forms in dimension five which we call strongly pseudoconvex, and show that for closed ...
Simon Donaldson, Fabian Lehmann
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Lp Estimates for Weak Solutions to Nonlinear Degenerate Parabolic Systems
Discrete Dynamics in Nature and Society, Volume 2017, Issue 1, 2017., 2017 This paper is devoted to the Lp estimates for weak solutions to nonlinear degenerate parabolic systems related to Hörmander’s vector fields. The reverse Hölder inequalities for degenerate parabolic system under the controllable growth conditions and natural growth conditions are established, respectively, and an important multiplicative inequality is ...
Na Wei +4 more
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Singular CR structures of constant Webster curvature and applications
Mathematische Nachrichten, Volume 297, Issue 3, Page 943-961, March 2024.Abstract We consider the sphere S2n+1$\mathbb {S}^{2n+1}$ equipped with its standard contact form. In this paper, we construct explicit contact forms on S2n+1∖S2k+1$\mathbb {S}^{2n+1}\setminus \mathbb {S}^{2k+1}$, which are conformal to the standard one and whose related Webster metrics have constant Webster curvature; in particular, it is positive if ...
Chiara Guidi +2 more
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Nonlinear subelliptic Schrodinger equations with external magnetic field
Electronic Journal of Differential Equations, 2004 To account for an external magnetic field in a Hamiltonian of a quantum system on a manifold (modelled here by a subelliptic Dirichlet form), one replaces the the momentum operator $frac 1i d$ in the subelliptic symbol by $frac 1i d-alpha$, where ...
Kyril Tintarev
doaj
Topics on subelliptic parabolic equations structured on Hörmander vector fields
, 2012 Marie Frentz
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