Limits of quotients of real analytic functions in two variables

Details Limits of quotients of real analytic functions in two variables Limits of quotients of real analytic functions in two variables

2010-11-06

arxiv.org/abs/1011.1591v1

Mathematics

Algebraic Geometry

Scientific paper

Necessary and sufficient conditions for the existence of limits of the form {equation*} \lim_{(x,y)\rightarrow (a,b)}\frac{f(x,y)}{g(x,y)} {equation*} are given, under the hipothesis that $f$ and $g$ are real analytic functions near the point $(a,b)$, and $g$ has an isolated zero at $(a,b)$. An algorithm (implemented in MAPLE 12) is also provided. This algorithm determines the existence of the limit, and computes it in case it exists. It is shown to be more powerful than the one found in the latest versions of MAPLE. The main tools used throughout are Hensel's Lemma and the theory of Puiseux series.

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