Articles by Author: Dymphna Javier

Search results for Dymphna Javier

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  1. The scale effect of economic development and freshwater quality in Nigeria: Environmental pollution of the Lower River Niger Basin

    The scale effect of economic development and freshwater quality in Nigeria: Environmental pollution of the Lower River Niger Basin

    River Niger is the third-longest river in Africa and the longest river in West Africa. The river basin traverses West and Central African countries, and forms a coastal delta (in southern Nigeria) where it empties into the Atlantic Ocean. The...
  2. Hybridisation between the Common Buzzard <em>Buteo buteo buteo</em> and the North African race of Long-legged Buzzard <em>Buteo rufinus cirtensis</em> in the Strait of Gibraltar: prelude or preclude to colonisation?

    Hybridisation between the Common Buzzard <em>Buteo buteo buteo</em> and the North African race of Long-legged Buzzard <em>Buteo rufinus cirtensis</em> in the Strait of Gibraltar: prelude or preclude to colonisation?

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Natural hybridisation in Old World buzzards (Buteo) is an uncommon phenomenon with important ecological implications. This genus constitutes an intricate radiation of genetically poorly differentiated raptors whose taxonomic classification is a frequent subject of debate. We report the first case...
  3. 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...
  4. 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,...
  5. 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...
  6. 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...