Results 11 to 20 of about 304 (131)
Subelliptic wave equations are never observable
Analysis & PDE, 2023 It is well-known that observability (and, by duality, controllability) of the elliptic wave equation, i.e., with a Riemannian Laplacian, in time $T_0$ is almost equivalent to the Geometric Control Condition (GCC), which stipulates that any geodesic ray meets the control set within time $T_0$.
Letrouit, Cyril
openaire +5 more sources
Limiting behavior of solutions of subelliptic heat equations [PDF]
Nonlinear Differential Equations and Applications NoDEA, 2007 We investigate the behavior, as e → 0+, of e log we (t, x) where we are solutions of a suitable family of subelliptic heat equations. Using the Large Deviation Principle, we show that the limiting behavior is described by the metric inf-convolution w.r.t. the associated Carnot-Caratheodory distance.
Dragoni, Federica
openaire +2 more sources
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 +2 more sources
Boundedness of pseudo-differential operators in subelliptic Sobolev and Besov spaces on compact Lie groups [PDF]
, 2023 In this paper, we investigate the Besov spaces on compact Lie groups in a subelliptic setting, that is, associated with a family of vector fields, satisfying the Hörmander condition, and their corresponding sub-Laplacian.
Ruzhansky, M +3 more
core +1 more source
Trilobites of Thailand's Cambrian–Ordovician Tarutao Group and their geological setting
Papers in Palaeontology, Volume 9, Issue 5, September/October 2023., 2023 Abstract Tuff‐bearing upper Cambrian to lowermost Ordovician strata on Ko Tarutao island, Satun province, southernmost peninsular Thailand, contain a rich trilobite fauna relevant to global biostratigraphy, peri‐Gondwanan palaeogeography and shifting evolutionary mode.
Shelly J. Wernette +3 more
wiley +1 more source
Zoologica Scripta, Volume 52, Issue 3, Page 235-248, May 2023., 2023 Abstract Species identification and delimitation are particularly challenging for morphologically similar and geographically overlapping species, such as in the case of Western Palaearctic flea beetle species Psylliodes kiesenwetteri Kutschera, 1864 and Psylliodes ruffoi Leonardi, 1975.
Emanuele Berrilli +3 more
wiley +1 more source
An interpolation problem in the Denjoy–Carleman classes
Mathematische Nachrichten, Volume 296, Issue 3, Page 902-914, March 2023., 2023 Abstract Inspired by some iterative algorithms useful for proving the real analyticity (or the Gevrey regularity) of a solution of a linear partial differential equation with real‐analytic coefficients, we consider the following question. Given a smooth function defined on [a,b]⊂R$[a,b]\subset {\mathbb {R}}$ and given an increasing divergent sequence ...
Paolo Albano, Marco Mughetti
wiley +1 more source
Journal of Systematics and Evolution, Volume 61, Issue 1, Page 42-63, January 2023., 2023 Floral variation in the genera of Urgineoideae Abstract The taxonomy and systematics of Urgineoideae (Hyacinthaceae) have been controversial in recent decades, with contrasting taxonomic treatments proposed based on preliminary and partial studies that have focused on morphology and/or solely plastid DNA sequence data. Some authors have recognized only
Mario Martínez‐Azorín +8 more
wiley +1 more source
Local and non‐local Poincaré inequalities on Lie groups
Bulletin of the London Mathematical Society, Volume 54, Issue 6, Page 2162-2173, December 2022., 2022 Abstract We prove a local Lp$L^p$‐Poincaré inequality, 1⩽p<∞$1\leqslant p < \infty$, on non‐compact Lie groups endowed with a sub‐Riemannian structure. We show that the constant involved grows at most exponentially with respect to the radius of the ball, and that if the group is non‐doubling, then its growth is indeed, in general, exponential.
Tommaso Bruno +2 more
wiley +1 more source
Interior a priori estimates for supersolutions of fully nonlinear subelliptic equations under geometric conditions [PDF]
, 2023 In this note, we prove interior a priori first- and second-order estimates for solutions of fully nonlinear degenerate elliptic inequalities structured over the vector fields of Carnot groups, under the main assumption that (Formula presented.) is ...
Goffi, Alessandro
core +1 more source