Published Paper

Inserted: 11 nov 2009
Last Updated: 16 feb 2015

Journal: Adv. Calc. Var.
Volume: 6
Pages: 415–432
Year: 2013
Doi: http://dx.doi.org/10.1515/acv-2012-0004

Abstract:

In two dimensions every weak solution to a nonlinear elliptic system $\rm{div } a(x,u,Du)=0$ has Hölder continuous first derivatives provided that standard continuity, ellipticity and growth assumptions hold with a growth exponent $p \geq 2$. We give an example showing that this result cannot be extended to the subquadratic case, i.e. that weak solutions are not necessarily continuous if $1< p <2$. Furthermore, we discuss related results for variational integrals.

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