Decision problem for a class of univariate Pfaffian functions

We address the decision problem for sentences involving univariate functions constructed from a fixed Pfaffian function of order 1. We present a new symbolic procedure solving this problem with a computable complexity based on the computation of suitable Sturm sequences. For a general Pfaffian funct...

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Published in:Applicable algebra in engineering, communication and computing Vol. 35; no. 2; pp. 207 - 232
Main Authors: Barbagallo, María Laura, Jeronimo, Gabriela, Sabia, Juan
Format: Journal Article
Language:English
Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.03.2024
Springer Nature B.V
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ISSN:0938-1279, 1432-0622
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Abstract We address the decision problem for sentences involving univariate functions constructed from a fixed Pfaffian function of order 1. We present a new symbolic procedure solving this problem with a computable complexity based on the computation of suitable Sturm sequences. For a general Pfaffian function, we assume the existence of an oracle to determine the sign that a function of the class takes at a real algebraic number. As a by-product, we obtain a new oracle-free effective algorithm solving the same problem for univariate E-polynomials based on techniques that are simpler than the previous ones, and we apply it to solve a similar decision problem in the multivariate setting. Finally, we introduce a notion of Thom encoding for zeros of an E-polynomial and describe an algorithm for their computation.
AbstractList We address the decision problem for sentences involving univariate functions constructed from a fixed Pfaffian function of order 1. We present a new symbolic procedure solving this problem with a computable complexity based on the computation of suitable Sturm sequences. For a general Pfaffian function, we assume the existence of an oracle to determine the sign that a function of the class takes at a real algebraic number. As a by-product, we obtain a new oracle-free effective algorithm solving the same problem for univariate E-polynomials based on techniques that are simpler than the previous ones, and we apply it to solve a similar decision problem in the multivariate setting. Finally, we introduce a notion of Thom encoding for zeros of an E-polynomial and describe an algorithm for their computation.
Author Jeronimo, Gabriela
Sabia, Juan
Barbagallo, María Laura
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  givenname: Juan
  surname: Sabia
  fullname: Sabia, Juan
  email: jsabia@dm.uba.ar
  organization: Ciclo Básico Común, Departamento de Ciencias Exactas, Universidad de Buenos Aires, Instituto de Investigaciones Matemáticas ”Luis A. Santaló” (IMAS), Consejo Nacional de Investigaciones Científicas y Técnicas, Universidad de Buenos Aires
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Keywords 68W30
Pfaffian functions
14P15
Decision problem
Sturm sequences
Complexity
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Snippet We address the decision problem for sentences involving univariate functions constructed from a fixed Pfaffian function of order 1. We present a new symbolic...
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SubjectTerms Algebra
Algorithms
Artificial Intelligence
Computation
Computer Hardware
Computer Science
Estimates
Original Paper
Partial differential equations
Polynomials
Sequences
Symbolic and Algebraic Manipulation
Theory of Computation
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Title Decision problem for a class of univariate Pfaffian functions
URI https://link.springer.com/article/10.1007/s00200-022-00545-8
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Volume 35
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