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math.AP2013
Regularity of the -Poisson equation in the plane
Erik Lindgren, Peter Lindqvist
We study the regularity of the -Poisson equation in the plane. In the case and we obtain the sharp Hölder exponent for the gra…
math.AP2013
The fractional Cheeger problem
Lorenzo Brasco, Erik Lindgren, Enea Parini
Given an open and bounded set , we consider the problem of minimizing the ratio between the perimeter and the dimensional Lebesgue measure among subse…
math.AP2013
Pointwise regularity of the free boundary for the parabolic obstacle problem
Erik Lindgren, Régis Monneau
We study the parabolic obstacle problem $$\lap u-u_t=fχ_{\{u>0\}}, \quad u\geq 0,\quad f\in L^p \quad \mbox{with}\quad f(0)=1$$ and obtain two monotonicity formulae, one that appli…