2 problems

Let $\operatorname{MA}(\mathbb{R}^d)$ denote the class used in the source, and let $\mathcal N$ be the class of compact sets admitting decreasing smooth-domain approximations with…

Let $\mathcal N$ be the class of compact sets $A\subset\mathbb{R}^d$ for which there exists a monotone sequence of compact smooth domains … with the masses of the normal cycles…