Articles by Author: Francisco Javier Garc A Pacheco

Search results for Francisco Javier Garc A Pacheco

We found 34 results for you
  1. On <em>i</em>-operators on real normed spaces

    On <em>i</em>-operators on real normed spaces

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    We gradually study i-operators on real vector spaces, on real topological vector spaces, and on real normed spaces. Among several things we prove the existence of real topological vector spaces (different from the James’ space) that are free of continuous...
  2. Linear topologies and sequential compactness in topological modules

    Linear topologies and sequential compactness in topological modules

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    We prove that an absolute semi-valued ring is first-countable if the set of invertibles is separable and its closure contains 0. We also show that every linearly topologized topological module over an absolute semi-valued ring whose invertibles approach 0 has...
  3. Rotundity in transitive and separable Banach spaces

    Rotundity in transitive and separable Banach spaces

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    In every separable Banach space the set of smooth points of the unit ball is a Gδ dense subset of the unit sphere. In this paper, we find some conditions in order to obtain a similar result for rotund points...
  4. Geometric properties on non-complete spaces

    Geometric properties on non-complete spaces

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    The purpose of this paper is to study certain geometrical properties for non-complete normed spaces. We show the existence of a non-rotund Banach space with a rotund dense maximal subspace. As a consequence, we prove that every separable Banach space...
  5. A unified view of the Dedekind completion of pointfree function rings

    A unified view of the Dedekind completion of pointfree function rings

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    We provide the appropriate unifying framework for the various descriptions of the Dedekind completion of the ring C(L) of continuous real functions on a frame L. It is based on suitable Galois connections and a general result about Galois connections,...
  6. Perfectness in locales

    Perfectness in locales

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    This paper makes a comparison between two notions of perfectness for locales which come as direct reformulations of the two equivalent topological definitions of perfectness. These reformulations are no longer equivalent. It will be documented that a locale may appropriately...
  7. AL- and AM-spaces of integrable scalar functions with respect to a Fréchet-valued measure

    AL- and AM-spaces of integrable scalar functions with respect to a Fréchet-valued measure

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    We study the question of determining conditions for the space of R-valued integrable functions with respect to a vector measure taking its values in a real Fréchet space to be an AL- or an AM-space.
  8. THE HAHN-BANACH EXTENSION PROPERTY IN A CLASS OF NORMED SPACES

    THE HAHN-BANACH EXTENSION PROPERTY IN A CLASS OF NORMED SPACES

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    Answering to a question formulated by A.F. MONNA, we study the Hahn-Banach extension property and other related topics within the context of A-normed spaces over valued fields.
  9. The use of African languages as medium of instruction in Mozambique: problems and possibilities

    The use of African languages as medium of instruction in Mozambique: problems and possibilities

    Item type: Journal Article • Journal: South African Journal of African Languages
    According to the figures released after the 1980 census, about 75.6% of the Mozambican population does not speak Portuguese and only 1.2% of the population speaks it as a mother tongue. The rest of the population either speaks it as...
  10. On the biology of the European flying squid <em>Todarodes sagittatus</em> (Lamarck, 1798) (Cephalopoda, Ommastrephidae) in the Central Eastern Atlantic

    On the biology of the European flying squid <em>Todarodes sagittatus</em> (Lamarck, 1798) (Cephalopoda, Ommastrephidae) in the Central Eastern Atlantic

    Item type: Journal Article • Journal: South African Journal of Marine Science
    A total of 206 specimens of the ommastrephid squid Todarodes sagittatus, obtained from three areas of the central eastern Atlantic (Canary Islands/African coast, Madeira, and the Gettysburg Bank area south of Portugal) were examined. New information on size, mass, length-mass...