All Questions

The theory of distributions is very interesting, and I have noticed that it has many applications especially with regard to PDEs. But what are the research topics in this theory? also in terms of ...

In the theory of Sobolev space, we have the following chain rule: For a uniformly Lipschitz function $F : \mathbf{R}\to \mathbf{R}$ such that $F(0)=0$, and $u\in W^{1,1}(\mathbf{R}^n)$, then we have ...