Results 81 to 90 of about 469 (136)

On Codazzi tensors on a hyperbolic surface and flat Lorentzian geometry

, 2015
Using global considerations, Mess proved that the moduli space of globally hyperbolic flat Lorentzian structures on $S\times\mathbb{R}$ is the tangent bundle of the Teichm\"uller space of $S$, if $S$ is a closed surface. One of the goals of this paper is
Bonsante, Francesco, Seppi, Andrea
core   +2 more sources

Prospectively accelerated dynamic speech magnetic resonance imaging at 3 T using a self‐navigated spiral‐based manifold regularized scheme

NMR in Biomedicine, Volume 37, Issue 8, August 2024.
Dynamic images can be modeled as points on a smooth nonlinear manifold embedded in a high dimensional ambient space. The manifold regularization exploits the neighborhood relations of points on this manifold. Image frames sharing similar vocal tract postures are mapped as neighbors on the manifold even if they occur at different times (see the red and ...
Rushdi Zahid Rusho, Abdul Haseeb Ahmed, Stanley Kruger, Wahidul Alam, David Meyer, David Howard, Brad Story, Mathews Jacob, Sajan Goud Lingala   +8 more
wiley   +1 more source

Basic Inequalities for Submanifolds of Conformal Kenmotsu Manifolds

Mathematics
In this paper, we have established some basic inequalities for the submanifolds of conformal Kenmotsu manifolds. As an application, we have also derived the same inequalities for the θ-slant submanifolds of conformal Kenmotsu manifolds.
Qiming Zhao, Mohamd Saleem Lone, Mehraj Ahmad Lone, Idrees Fayaz Harry, Yongqiao Wang   +4 more
doaj   +1 more source

Space-time least-squares isogeometric method and efficient solver for parabolic problems

, 2019
In this paper, we propose a space-time least-squares isogeometric method to solve parabolic evolution problems, well suited for high-degree smooth splines in the space-time domain. We focus on the linear solver and its computational efficiency: thanks to
Montardini, Monica, Negri, Matteo, Sangalli, Giancarlo, Tani, Mattia   +3 more
core   +1 more source

Connections and the Second Main Theorem for Holomorphic Curves [PDF]

, 2011
By means of $C^\infty$-connections we will prove a general second main theorem and some special ones for holomorphic curves. The method gives a geometric proof of H. Cartan's second main theorem in 1933.
Noguchi, Junjiro
core   +1 more source

Arithmetic theory of q-difference equations. The q-analogue of Grothendieck-Katz's conjecture on p-curvatures

, 2002
Grothendieck's conjecture on p-curvatures predicts that an arithmetic differential equation has a full set of algebraic solutions if and only if its reduction in positive characteristic has a full set of rational solutions for almost all finite places ...
Di Vizio, Lucia
core   +1 more source

Smoothing effects for the filtration equation with different powers

, 2017
We study the nonlinear diffusion equation $ u_t=\Delta\phi(u) $ on general Euclidean domains, with homogeneous Neumann boundary conditions. We assume that $ \phi^\prime(u) $ is bounded from below by $ |u|^{m_1-1} $ for small $ |u| $ and by $ |u|^{m_2-1} $
Fotache, Alin Razvan, Muratori, Matteo
core   +1 more source

Global attractors for gradient flows in metric spaces [PDF]

, 2009
We develop the long-time analysis for gradient flow equations in metric spaces. In particular, we consider two notions of solutions for metric gradient flows, namely energy and generalized solutions.
Rossi, Riccarda, Segatti, Antonio, Stefanelli, Ulisse   +2 more
core  

Inequalities involving Casorati curvatures for submanifolds of real space forms with a quarter-symmetric connection

Filomat, 2022
In this paper, we obtain some inequalities based on Casorati curvature for submanifolds in a real space form with a special kind of quarter-symmetric connection.
openaire   +1 more source

Weighted Energy-Dissipation principle for gradient flows in metric spaces

, 2018
This paper develops the so-called Weighted Energy-Dissipation (WED) variational approach for the analysis of gradient flows in metric spaces. This focuses on the minimization of the parameter-dependent global-in-time functional of trajectories ...
Rossi, Riccarda, Savaré, Giuseppe, Segatti, Antonio, Stefanelli, Ulisse   +3 more
core   +1 more source