We show that any weak solution to elliptic equations in divergence form is continuously differentiable provided that the modulus of continuity of coefficients in the L1-mean sense satisfies the Dini condition. This in particular answers a question recently raised by Yanyan Li and allows us to improve a result of Haïm Brezis. We also prove a weak type-(1,1) estimate under a stronger assumption on the modulus of continuity. The corresponding results for nondivergence form equations are also established.
|Number of pages||19|
|Journal||Communications in Partial Differential Equations|
|Publication status||Published - 2017 Mar 4|
Bibliographical notePublisher Copyright:
© 2017 Taylor & Francis.
All Science Journal Classification (ASJC) codes
- Applied Mathematics