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Journal of Mathematical Analysis and Applications
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Journal of Mathematical Analysis and Applications
Article . 1988
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Journal of Mathematical Analysis and Applications
Article . 1988 . Peer-reviewed
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On Lojasiewicz-type inequalities for exponential polynomials

Authors: Carlos A. Berenstein; A. Yger; A. Yger;

On Lojasiewicz-type inequalities for exponential polynomials

Abstract

The authors consider Lojasiewicz inequalities for exponential polynomials in one or several real or complex variables. Such inequalities are lower bounds for the functions in terms of the distance from the zero set. Closely connected with this, in the case of functions of a single variable, are questions about the separation of the zeros from one another. The authors discuss the connections of these questions with transcendental number theory and describe the present `state of the art'. They use the methods of Gelfond for algebraic independence to show that if \[ f(z)=\sum_{\gamma \in \Gamma}e^{\gamma z} p_{\gamma}(z), \] where the \(p_{\gamma}(z)\) are polynomials with algebraic coefficients of which only finitely many are non-zero and \(\Gamma\) is the additive subgroup of \({\mathbb{C}}\) generated by 1,w and w 2 where w is a cube irrationality, then for every \(\epsilon >0\) there exist constants \(c_ 1,c_ 2>0\) so that if \(z_ 1,z_ 2\) are distinct zeros of f then \(| z_ 1-z_ 2| >c_ 1 \exp (-c_ 2| z_ 1|^{4+\epsilon})\). The authors show that if \(f_ 1,...,f_ n\) are n such functions and if V is the set of common zeros then for \(\epsilon >0\), \(a_ 1,a_ 2>0\), there exist \(b_ 1,b_ 2>0\) so that for any z with \[ dist(z,V)>a_ 1 \exp (-a_ 2| z|^{4+\epsilon}) \] one has the Lojasiewicz inequality \[ \sum | f_ j(z)| \quad >\quad b_ 1 \exp (-b_ 2| z|^{4+\epsilon}). \] The authors discuss the case of functions of several variables and pose some problems.

Keywords

Lojasiewicz inequalities, Applied Mathematics, Inequalities in the complex plane, Trigonometric and exponential sums (general theory), exponential polynomials, Analysis, Exponential and trigonometric functions

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
9
Average
Average
Average
hybrid