“…To trace the history of the problem the reader may consult [4,5,8,10]. The main results, Theorems 1.1, 1.8, 1.9 and Corollary 1.7, are new and considerably stronger than the ones previously known.…”
Abstract. An algebraic criterion is given for a power series in n variables over a field of characteristic 0 to be equivalent to a polynomial in n -k variables over the ring of power series in k variables. For convergent power series over the reals or complexes a geometric interpretation of the criterion is established. An analogous sufficient condition is obtained for germs of smooth functions. Most of the previously known results follow easily from the criterion.
“…To trace the history of the problem the reader may consult [4,5,8,10]. The main results, Theorems 1.1, 1.8, 1.9 and Corollary 1.7, are new and considerably stronger than the ones previously known.…”
Abstract. An algebraic criterion is given for a power series in n variables over a field of characteristic 0 to be equivalent to a polynomial in n -k variables over the ring of power series in k variables. For convergent power series over the reals or complexes a geometric interpretation of the criterion is established. An analogous sufficient condition is obtained for germs of smooth functions. Most of the previously known results follow easily from the criterion.
“…The quotient (4.2) is of finite dimension T = r(A) by the assumption. By Tougeron's Theorem [11] there exists a local coordinate system uj near the origin such that ^ is a polynomial in uj.…”
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