Estudio en coordenadas polares de la posición de una curva respecto a una asíntota.
Characterizations of tauberian operators and other semigroups
Unconditionally converging operators and Fredholm theory
Factorization of operators and duality
Semiembeddings and semi-Fredholm operators
On incomparability of Banach spaces.
Semi-Fredholm operators and semigroups associated with some classical operator ideals
Semi-Fredholm operators and semigroups associated with some classical operators ideals (II)
Lifting results for sequences in Banach spaces
On relatively contractive relations in pairs of generalized uniform spaces.
J. C. Mathews and D. W. Curtis, [4], have introduced some structures which generalize structures of uniform types to the product of two sets, and they obtain a generalized version of Banach's contraction mapping theorem. In this note we prove that these structures are obtained from the usual analogues by means of a particular bijection; hence we do not have a meaningful generalization. For example, this bijection provides, from a result by A. S. Davies, [1], an analogue of Banach's well-known contraction...
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