Computing tensor generalized inverses via specialization and rationalization

In this paper, we introduce the notion of outer generalized inverses, with predefined range and none space, of tensors with rational function entries equipped with the Einstein product over an arbitrary field, of characteristic zero, with or without involution. We assume that the involved tensor ent...

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Detalles Bibliográficos
Autores: Stanimirovic, Predrag S., Sendra Pons, Juan Rafael|||0000-0003-2568-1159, Behera, Ratikanta, Sahoo, Jajati Keshari, Mosic, Dijana, Sendra Pons, Juana, Lastra Sedano, Alberto|||0000-0002-4012-6471
Tipo de recurso: artículo
Fecha de publicación:2021
País:España
Institución:Universidad de Alcalá (UAH)
Repositorio:e_Buah Biblioteca Digital Universidad de Alcalá
Idioma:inglés
OAI Identifier:oai:ebuah.uah.es:10017/50517
Acceso en línea:http://hdl.handle.net/10017/50517
https://dx.doi.org/10.1007/s13398-021-01057-9
Access Level:acceso abierto
Palabra clave:Tensor
Einstein product
Tensors of functions
Outer inverse
Meromorphic functions
Symbolic computation
Matemáticas
Mathematics
Descripción
Sumario:In this paper, we introduce the notion of outer generalized inverses, with predefined range and none space, of tensors with rational function entries equipped with the Einstein product over an arbitrary field, of characteristic zero, with or without involution. We assume that the involved tensor entries are rational functions of unassigned variables or rational expressions of functional entries. The research investigates the replacements in two stages. The lower-stage replacements assume replacements of unknown variables by constant values from the field. The higher-order stage assumes replacements of functional entries by unknown variables. This approach enables the calculation on tensors over meromorphic functions to be simplified by analogous calculations on matrices whose elements are rational expressions of variables. In general, the derived algorithms permit symbolic computation of various generalized inverses which belong to the class of outer generalized inverses, with prescribed range and none space, over an arbitrary field of characteristic zero. More precisely, we focus on a few algorithms for symbolic computation of outer inverses of matrices whose entries are elements of a field of characteristic zero or a field of meromorphic functions in one complex variable over a connected open subset of C. Illustrative numerical results validate the theoretical results.