Articles by Author: Oscar Valero

Search results for Oscar Valero

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  1. Approximating SP-orders through total preorders: incomparability and transitivity through permutations

    Approximating SP-orders through total preorders: incomparability and transitivity through permutations

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    We study finite partial orders and the concept of indistinguishability. In particular, we focus on SP-orders. These orderings can be represented by means of Hasse diagrams and numerical labels. Since these numerical representations can be interpreted by means of permutations,...
  2. Qualitative versus quantitative fixed point techniques in computer science

    Qualitative versus quantitative fixed point techniques in computer science

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    In 1970, a qualitative fixed point technique useful to model the recursive specifications in denotational semantics was developed by means of the celebrated Kleene‘s fixed point theorem. Later on, in 1994 and 1995, quantitative counterparts of the aforesaid technique, but...
  3. Remarks on (Q, P, Y)-Summing Operators

    Remarks on (Q, P, Y)-Summing Operators

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    An operator T ∈ ΠY q,p, (Xˇ⊗ Y, Z) if there exists a constant C > 0 such that, for any finite sequence u 1 , u 2 ,..., u N inX ⊗ Y, we have
  4. (<em>p,</em>
               <em>q</em>)-Summing Sequences of Operators

    (<em>p,</em> <em>q</em>)-Summing Sequences of Operators

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    A sequence (u j)j∈N of operators inL (X, Y) is a (p, q)-summing multiplier (or (p, q)-summing sequence of operators), in short (u j) ∈l πp, q (X, Y), if there exists a constant C > 0 such that, for...
  5. Water relations of <em>Eucalyptus nitens</em> × <em>Eucalyptus grandis</em>: is there interclonal variation in response to experimentally imposed water stress?

    Water relations of <em>Eucalyptus nitens</em> × <em>Eucalyptus grandis</em>: is there interclonal variation in response to experimentally imposed water stress?

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    This study tested the hypothesis that water stress increases the hydraulic efficiency of Eucalyptus nitens × E. grandis saplings as a result of osmotic and elastic adjustments. Eucalyptus nitens × E. grandis clones (NH00, NH58, NH69 and NH70) were potted...
  6. What's culture got to do with it? Examining job embeddedness and organizational commitment and turnover intentions in South Africa

    What's culture got to do with it? Examining job embeddedness and organizational commitment and turnover intentions in South Africa

    Item type: Journal Article • Journal: Africa Journal of Management
    Using a longitudinal design this study examines the relationship between job embeddedness, organizational commitment and turnover intentions using a sample of South African professionals. Results show that job embeddedness had a positive relationship on organizational commitment and a negative relationship...
  7. Phenomenology as a Potential Methodology for Subjective Knowing in Science Education Research

    Phenomenology as a Potential Methodology for Subjective Knowing in Science Education Research

    Item type: Journal Article • Journal: Indo-Pacific Journal of Phenomenology
    This paper charts the journey that led to the author's discovery of phenomenology as a potential research methodology in the field of science education, and describes the impact on his own thinking and approach of his encounters with the work...
  8. The influence of transformational leadership on organisational citizenship behaviour in a South African combat military unit

    The influence of transformational leadership on organisational citizenship behaviour in a South African combat military unit

    Item type: Journal Article • Journal: Journal of Psychology in Africa
    This study investigated perceived individual transformational leadership (TL) to influence behaviours on follower organisational citizenship behaviour (OCB) in a South African combat military unit. A sample of 300 of 567 military followers (males = 78%; black Africans = 82%) completed...