Charles Fefferman 氏 (Princeton University)
『 Extension of Functions and Interpolation of Data 』

内容:
Let $f$ be a given real-valued function defined on a subset of $\mathbb{R}^n$. We explain how to decide whether $f$ extends to a function $F$ in $C^m(\mathbb{R}^n)$. If such an $F$ exists, we show how to construct one.