384 resultados para Logica algebrica
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Mode of access: Internet.
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En port.: Obra destinada a la enseñanza en el Real Colegio general militar.
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Mode of access: Internet.
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Mode of access: Internet.
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Mode of access: Internet.
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Includes index.
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Mode of access: Internet.
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Collation of the original: 250 l.
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"A portion of the following pages has already appeared in two articles contributed ... to the North British Review."--Pref.
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Las relaciones asimétricas entre los géneros encuentran expresión en la organización del espacio urbano: las ciudades son percibidas, construidas y habitadas de manera diferencial por mujeres y hombres, de acuerdo con la identidad socialmente asignada y culturalmente construida por cada género.
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In this paper, we determine the lower central and derived series for the braid groups of the sphere. We are motivated in part by the study of Fadell-Neuwirth short exact sequences, but the problem is important in its own right. The braid groups of the 2-sphere S(2) were studied by Fadell, Van Buskirk and Gillette during the 1960s, and are of particular interest due to the fact that they have torsion elements (which were characterised by Murasugi). We first prove that for all n epsilon N, the lower central series of the n-string braid group B(n)(S(2)) is constant from the commutator subgroup onwards. We obtain a presentation of Gamma(2)(Bn(S(2))), from which we observe that Gamma(2)(B(4)(S(2))) is a semi-direct product of the quaternion group Q(8) of order 8 by a free group F(2) of rank 2. As for the derived series of Bn(S(2)), we show that for all n >= 5, it is constant from the derived subgroup onwards. The group Bn(S(2)) being finite and soluble for n <= 3, the critical case is n = 4 for which the derived subgroup is the above semi-direct product Q(8) (sic) F(2). By proving a general result concerning the structure of the derived subgroup of a semi-direct product, we are able to determine completely the derived series of B(4)(S(2)) which from (B(4)(S(2)))(4) onwards coincides with that of the free group of rank 2, as well as its successive derived series quotients.
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World Transport Policy & Practice, Vol.6, nº2, (2000)
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Trabalho de Projecto apresentado para cumprimento dos requisitos necessários à obtenção do grau de Mestre em Teaching English as a Second / Foreign Language.
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Dissertação para obtenção do Grau de Mestre em Logica Computicional
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"Vegeu el resum a l'inici del document del fitxer adjunt."