4 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…

Let an igregularity class be a class $\mathcal C$ of compact subsets of $\mathbb{R}^d$ such that every $A\in\mathcal C$ admits a normal cycle $N(A)$, the class is stable under diff…

Let $A,B$ be compact WDC sets with d.c. auras $f,g$, respectively, and let $\operatorname{nor}(f,0)$ and $\operatorname{nor}(g,0)$ denote their unit normal bundles. Vanishing-produ…