4 papers
Boundary Behavior of Subelliptic Parabolic Equations on Time-Dependent Domains
Marie Frentz, Elin Götmark
In this paper we study the boundary behavior of solutions of a divergence-form subelliptic heat equation in a time-varying domain Ωin R^{n+1}, structured on a set of vector fields…
Regularity in the Obstacle Problem for Parabolic Non-divergence Operators of Hörmander type
Marie Frentz
In this paper we continue the study initiated in [FGN] concerning the obstacle problem for a class of parabolic non-divergence operators structured on a set of vector fields X = {X…
Reformulation of the extension of the -metric for
Marie Frentz, Amol Sasane
The classical nu-metric introduced by Vinnicombe in robust control theory for rational plants was extended to classes of nonrational transfer functions in Ball and Sasane [Complex…
Non-divergence form parabolic equations associated with non-commuting vector fields: Boundary behavior of nonnegative solutions
M. Frentz, N. Garofalo, E. Götmark +2
In a cylinder we study the boundary behavior of nonnegative solutions of second order parabolic equations of the form \[ Hu =\sum_{i,j=1}^ma_{…