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Theoretical Computer Science
Article . 2021 . Peer-reviewed
License: Elsevier TDM
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https://dx.doi.org/10.48550/ar...
Article . 2020
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Theoretical Computer Science
Article . 2021 . Peer-reviewed
http://dx.doi.org/10.1016/j.tc...
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The set of hyperbolic equilibria and of invertible zeros on the unit ball is computable

Authors: Graça, Daniel; Zhong, Ning;

The set of hyperbolic equilibria and of invertible zeros on the unit ball is computable

Abstract

In this note, we construct an algorithm that, on input of a description of a structurally stable planar dynamical flow $f$ defined on the closed unit disk, outputs the exact number of the (hyperbolic) equilibrium points and their locations with arbitrary accuracy. By arbitrary accuracy it is meant that any accuracy required by the input can be achieved. The algorithm can be further extended to a root-finding algorithm that computes the exact number of zeros as well the location of each zero of a continuously differentiable function $f$ defined on the closed unit ball of $\mathbb{R}^{d}$, provided that the Jacobian of $f$ is invertible at each zero of $f$; moreover, the computation is uniform in $f$.

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Keywords

computability, FOS: Computer and information sciences, Computability, Global root-finding algorithm, 03D78 (Primary) 37C20, 37C25, 26B10 (Secondary), Mathematics - Logic, Nonlinear ordinary differential equations and systems, Computational Complexity (cs.CC), Approximation methods and numerical treatment of dynamical systems, Hyperbolic equilibria, Computing the number of zeros of a function, computing number of zeros of function, hyperbolic equilibria, Computer Science - Computational Complexity, FOS: Mathematics, Computation over the reals, computable analysis, Logic (math.LO), global root-finding algorithm

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selected citations
These citations are derived from selected sources.
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!
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