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Quasi-metrization and completion for Pervin's quasi-uniformity.

V. GregoriJ. Ferrer — 1982

Stochastica

R. Stoltenberg characterized in [2] those quasi-uniformities which are quasi-pseudometrizable, as well as those quasi-metric spaces which have a quasi-metric completion. In this paper we follow Stoltenberg's work by giving characterizations for quasi-metrizability and quasi-metric completion for a particular type of quasi-uniform spaces, the Pervin's quasi-uniform space.

Comparación de dos tablas demográficas: aproximación a su significación estadística.

Ernesto J. Veres Ferrer — 2000

Qüestiió

En este trabajo se analiza la significación estadística de la posible igualdad de dos tablas demográficas. Concretamente, se presenta la aplicabilidad de un clásico contraste de los métodos estadísticos -el de homogeneidad de dos distribuciones- para contrastar la hipótesis nula "H = las dos tablas demográficas son iguales, esto es, responden a una misma estructura del fenómeno demográfico estudiado", frente a la alternativa que niega la anterior. Ambas tablas se refieren a un único fenómeno demográfico...

Pták homomorphism theorem revisited

J. R. FerrerM. López PellicerL. M. Sánchez Ruiz — 2000

Czechoslovak Mathematical Journal

Rodrigues’ extension (1989) of the classical Pták’s homomorphism theorem to a non-necessarily locally convex setting stated that a nearly semi-open mapping between a semi-B-complete space and an arbitrary topological vector space is semi-open. In this paper we study this extension and, as a consequence of the results obtained, provide an improvement of Pták’s homomorphism theorem.

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