Some Results on Formal Power Series and Differentiable Functions
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Some Results on Formal Power Series and Differentiable Functions
and Differentiable Functions. By. Masahiro SHIOTA. § I. Introduction. In [2] we see that any formal power series in two variables with coefficients in R or C (in this ...
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Some Results on Formal Power Series and Differentiable Functions By Masahiro SHIOTA
§ I.
Introduction
In [2] we see that any formal power series in two variables with coefficients in R or C (in this paper only the real case will be considered,) can be transformed to a polynomial by some automorphism change of the variables.
In [3]
Whitney shows an example which is a convergent
series in three variables but which cannot be transformed to a polynomial. In this paper we give a formal power series example in three variables that is never transformed to be convergent (§ 2). A formal power series is the Taylor expansion of some C°° function at the origin by E. Bore] theorem.
The followings refine it.
Theorem 1. Let f be a formal power series in the variables jc= (xl9'",a;n). Let K be a positive real. There exists a C°° function g defined on \x\2 and k + oo for n^>2 and k
