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Título:
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Sums of squares in real rings
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Autores:
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Fernando Galván, José Francisco ;
Ruiz Sancho, Jesús María ;
Scheiderer, Claus
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Tipo de documento:
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texto impreso
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Editorial:
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American Mathematical Society, 2004
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/restrictedAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Matemáticas: Teoría de números
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Materia = Ciencias: Matemáticas: Geometria algebraica
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Tipo = Artículo
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Resumen:
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Let A be an excellent ring. We show that if the real dimension of A is at least three then A has in finite Pythagoras number, and there exists a positive semidefinite element in A which is not a sum of squares in A.
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En línea:
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https://eprints.ucm.es/id/eprint/15168/1/13.pdf
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