Results 91 to 100 of about 85,041 (264)

Axiomatic theory of Sobolev spaces

open access: yesExpositiones Mathematicae, 2001
Let \((X,d,\mu)\) be a set \(X\), equipped with a metric \(d\) and a Borel measure \(\mu\). For any \(u\in L^{\text{loc}}_p (X)\), so-called pseudo-gradients \(D[u]\) are introduced axiomatically, and on this basis \(p\)-Dirichlet energies, which, in turn, are used to introduce Sobolev spaces \(W^1_p (X)\).
Marc Troyanov, Vladimir Gol'dshtein
openaire   +3 more sources

Traces of multipliers in pairs of weighted Sobolev spaces

open access: yesJournal of Function Spaces and Applications, 2005
We prove that the pointwise multipliers acting in a pair of fractional Sobolev spaces form the space of boundary traces of multipliers in a pair of weighted Sobolev space of functions in a domain.
Vladimir Maz'ya, Tatyana Shaposhnikova
doaj   +1 more source

New characterizations of magnetic Sobolev spaces

open access: yesAdvances in Nonlinear Analysis, 2018
We establish two new characterizations of magnetic Sobolev spaces for Lipschitz magnetic fields in terms of nonlocal functionals. The first one is related to the BBM formula, due to Bourgain, Brezis and Mironescu. The second one is related to the work of
Nguyen Hoai-Minh   +3 more
doaj   +1 more source

Weighted Sobolev Spaces on Metric Measure Spaces

open access: yes, 2015
We investigate weighted Sobolev spaces on metric measure spaces $(X,d,m)$. Denoting by $\rho$ the weight function, we compare the space $W^{1,p}(X,d,\rho m)$ (which always concides with the closure $H^{1,p}(X,d,\rho m)$ of Lipschitz functions) with the ...
Ambrosio, Luigi   +2 more
core  

Quasi‐invariance of Gaussian measures for the 3d$3d$ energy critical nonlinear Schrödinger equation

open access: yesCommunications on Pure and Applied Mathematics, Volume 78, Issue 12, Page 2305-2353, December 2025.
Abstract We consider the 3d$3d$ energy critical nonlinear Schrödinger equation with data distributed according to the Gaussian measure with covariance operator (1−Δ)−s$(1-\Delta)^{-s}$, where Δ$\Delta$ is the Laplace operator and s$s$ is sufficiently large. We prove that the flow sends full measure sets to full measure sets. We also discuss some simple
Chenmin Sun, Nikolay Tzvetkov
wiley   +1 more source

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