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On the mortality problem for matrices of low dimensions

Identifieur interne : 00A174 ( Main/Exploration ); précédent : 00A173; suivant : 00A175

On the mortality problem for matrices of low dimensions

Auteurs : Olivier Bournez [France] ; Michael Branicky

Source :

RBID : Hal:inria-00099293

Descripteurs français

mix :
- computability, décidabilité, matrices, mortality, mortalité.

Abstract

In this paper, we discuss the existence of an algorithm to decide if a given set of $2 \times 2$ matrices is mortal: a set $F=\{A_1,\dots,A_m\}$ of $2 \times 2$ matrices is said to be \motnouv{mortal} if there exist an integer $k \ge 1$ and some integers $i_1,i_2,\dots,i_k \in \{1, \ldots, m\}$ with $A_{i_1} A_{i_2} \cdots A_{i_k}=0$. We survey this problem and propose some new extensions: we prove the problem to be BSS-undecidable for real matrices and Turing-decidable for two rational matrices. We relate the problem for rational matrices to the entry equivalence problem, to the zero in the left upper corner problem and to the reachability problem for piecewise affine functions. Finally, we state some NP-completeness results.

Url:

https://hal.inria.fr/inria-00099293

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">In this paper, we discuss the existence of an algorithm to decide if a given set of $2 \times 2$ matrices is mortal: a set $F=\{A_1,\dots,A_m\}$ of $2 \times 2$ matrices is said to be \motnouv{mortal} if there exist an integer $k \ge 1$ and some integers $i_1,i_2,\dots,i_k \in \{1, \ldots, m\}$ with $A_{i_1} A_{i_2} \cdots A_{i_k}=0$. We survey this problem and propose some new extensions: we prove the problem to be BSS-undecidable for real matrices and Turing-decidable for two rational matrices. We relate the problem for rational matrices to the entry equivalence problem, to the zero in the left upper corner problem and to the reachability problem for piecewise affine functions. Finally, we state some NP-completeness results.</div>
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On the mortality problem for matrices of low dimensions

On the mortality problem for matrices of low dimensions

Source :

Descripteurs français

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri