Proceedings of the American Mathematical Society, Vol. 109, No. 2 (Jun., 1990), pp. 357-367 (11 pages) We characterize the classes CM(I) and C* M(I) of infinitely differentiable functions which are ...
Let $U$ be an open semi-algebraic subset of $\mathbf{R}^n$ and let $X$ be a closed analytic subset of $U$ which is also a semi-algebraic set (e.g., $U = \mathbf{R}^n ...
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