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Better Answers to Real Questions

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons127668

Košta,  Marek
Automation of Logic, MPI for Informatics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons73108

Sturm,  Thomas
Automation of Logic, MPI for Informatics, Max Planck Society;

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Zitation

Košta, M., Sturm, T., & Dolzmann, A. (2016). Better Answers to Real Questions. Journal of Symbolic Computation, 74, 255-275. doi:10.1016/j.jsc.2015.07.002.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0026-A93B-2
Zusammenfassung
We consider existential problems over the reals. Extended quantifier elimination generalizes the concept of regular quantifier elimination by providing in addition answers, which are descriptions of possible assignments for the quantified variables. Implementations of extended quantifier elimination via virtual substitution have been successfully applied to various problems in science and engineering. So far, the answers produced by these implementations included infinitesimal and infinite numbers, which are hard to interpret in practice. We introduce here a post-processing procedure to convert, for fixed parameters, all answers into standard real numbers. The relevance of our procedure is demonstrated by application of our implementation to various examples from the literature, where it significantly improves the quality of the results.