General existence of solutions to dynamic programming principle
Qing Liu, Armin Schikorra
Comm. Pure and Applied Analysis.
14 (2015), no. 1, 167–184
special issue on Emerging Trends in Nonlinear PDE
Lipschitz homotopy and density of Lipschitz mappings in Sobolev spaces
A note on zero sets of fractional sobolev functions with negative power of integrability