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Ultradifferentiable functions on lines in

Authors:	Tejinder Neelon

Institution:	Department of Mathematics, California State University San Marcos, San Marcos, California 92096-0001

Abstract:	It is well known that a function $f\in C^{\infty }(\mathbb{R}^{n})$ whose restriction to every line in $\mathbb{R}^{n}$ is real analytic must itself be real analytic. In this note we study whether this property of real analytic functions is also possessed by some other subclasses of $C^{\infty }$ functions. We prove that if $f\in C^{\infty }(\mathbb{R}^{n})$ is ultradifferentiable corresponding to a sequence $\{M_{k}\}$ on every line in some `uniform way', then is ultradifferentiable corresponding to the sequence $\{M_{k}\}.$

Keywords:	Ultradifferentiable functions Vandermonde determinants

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