Search
Search results for
We found
6 results for you
-
A Pointfree Study of Bases For Spaces Of Minimal Prime Ideals
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Melvin Henriksen Joanne Walters-WaylandLet C (X) denote the ring of all real-valued continuous functions on a topological space X, and mX its space of minimal prime ideals with the hull-kernel topology. It has a base consisting of clopen sets and which contains the... -
Asymmetric filter convergence and completeness
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: John Frith --- Department of Mathematics and Applied Mathematics, South Africa Anneliese Schauerte --- Department of Mathematics and Applied Mathematics, South AfricaCompleteness for metric spaces is traditionally presented in terms of convergence of Cauchy sequences, and for uniform spaces in terms of Cauchy filters. Somewhat more abstractly, a uniform space is complete if and only if it is closed in every... -
Spermatozoa morphology and ultrastructure in Nile perch, Lates niloticus (Linnaeus, 1758)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D Kahwa --- Department of Wildlife and Aquatic Resources, Uganda E Nyatia --- Department of Biotechnical and Diagnostic Services, Uganda J Rutaisire --- Aquaculture Research and Development Centre, Uganda H Kaiser --- Department of Ichthyology and Fisheries Science, South AfricaLates niloticus is a valuable commercial fish species with good potential for aquaculture. However, there is limited information on the type and structure of the Nile perch spermatozoon, which could potentially aid in culture of this species. Here, we describe... -
A look at the structure of congruence frames by means of Heyting congruences
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: John Frith --- University of Cape Town, South Africa Anneliese Schauerte --- University of Cape Town, South AfricaThis paper concerns the congruence frame in the setting of partial frames, which, in contrast to full frames, do not necessarily have all joins. Examples of these include bounded distributive lattices, σ- and κ-frames. A new class of congruences, called... -
A construction of the assembly of a frame
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Richard N. Ball --- University of Denver, U.S.AWe offer here a particularly simple and direct construction of the congruence frame of a given frame, aka its assembly, from the bounded meet semilattice of differences of frame elements. The construction enables economical proofs of two of the assembly’s... -
Wadi estuary sediments on the Moroccan Mediterranean coast: an assessment of the impact of heavy metals using phytotoxicity and genotoxicity
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Nadia Belemlih --- Scientific Institute, Mohammed V University, Morocco Ahmed Khadra --- Cadi Ayyad University, Morocco Mohamed Oubane --- Cadi Ayyad University, Morocco Tarik Louzizi --- Ibn Tofail University, Morocco Mohammed Fekhaoui --- Scientific Institute, Mohammed V University, MoroccoTo evaluate the genotoxicity in the Loukkos River estuary, chemical and toxicological analyses were performed on water and sediments collected from six wadis. Heavy metal contents (Cr, Cu, Ni, Zn, Cd, Fe, and Pb), germination tests in lettuce, turnip, and...