Canonical Forms for Reachable Systems over Von Neumann Regular Rings

Andrés Sáez-Schwedt
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Andrés Sáez-Schwedt: Departamento de Matemáticas, Universidad de León, Campus de Vegazana, 24071 Leon, Spain

Mathematics, 2022, vol. 10, issue 11, 1-12

Abstract: If ( A , B ) is a reachable linear system over a commutative von Neumann regular ring R , a finite collection of idempotent elements is defined, constituting a complete set of invariants for the feedback equivalence. This collection allows us to construct explicitly a canonical form. Relations are given among this set of idempotents and various other families of feedback invariants. For systems of fixed sizes, the set of feedback equivalent classes of reachable systems is put into 1-1 correspondence with an appropriate partition of S p e c ( R ) into open and closed sets. Furthermore, it is proved that a commutative ring R is von Neumann regular if and only if every reachable system over R is a finite direct sum of Brunovsky systems, for a suitable decomposition of R .

Keywords: systems over commutative rings; feedback equivalence; von neumann regular rings (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
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