Artículo
Effective differential Lüroth's theorem
Fecha de publicación:
05/2014
Editorial:
Academic Press Inc Elsevier Science
Revista:
Journal of Algebra
ISSN:
0021-8693
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
This paper focuses on effectivity aspects of the Lüroth's theorem in differential fields. Let F be an ordinary differential field of characteristic 0 and F〈u〉 be the field of differential rational functions generated by a single indeterminate u. Let be given non-constant rational functions v1,vn∈F〈u〉 generating a differential subfield G⊆F〈u〉. The differential Lüroth's theorem proved by Ritt in 1932 states that there exists v∈G such that G=F〈v〉. Here we prove that the total order and degree of a generator v are bounded by minjord(vj) and (n d(e +1) +1)2e +1, respectively, where e:=maxjord(vj) and d:=maxjdeg(vj). As a byproduct, our techniques enable us to compute a Lüroth generator by dealing with a polynomial ideal in a polynomial ring in finitely many variables.
Palabras clave:
12H05
,
12Y05
,
DIFFERENTIAL ALGEBRA
,
DIFFERENTIATION INDEX
,
LÜROTH'S THEOREM
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Articulos(IMAS)
Articulos de INSTITUTO DE INVESTIGACIONES MATEMATICAS "LUIS A. SANTALO"
Articulos de INSTITUTO DE INVESTIGACIONES MATEMATICAS "LUIS A. SANTALO"
Citación
D'Alfonso, Lisi; Jeronimo, Gabriela Tali; Solernó, Pablo Luis; Effective differential Lüroth's theorem; Academic Press Inc Elsevier Science; Journal of Algebra; 406; 5-2014; 1-19
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