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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"coverings"”.
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Coverings and Descent Theory of Finite Spaces
… but the equivalence between the category of coverings of a connected finite topological space and the actions of the fundamental group of that space. Since some descent theory is necessary for categorical Galois theory, this thesis also contains an account of some of the descent theory of …
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Graded artin algebras, coverings and factor rings
Let (Γ,ρ) be a directed graph with relations. Let F: Γ’ → Γ be a topological covering. It is proved in this thesis that there is a set of relations ρ̅ on Γ such that the category of K-respresentations of Γ’ whose images under the covering functor satisfy ρ is equivalent to the category of …
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On the topology of the spaces of coverings
The spaces of coverings (SoC) arise from various configuration spaces of the covering problems. We study the topology of these spaces for different domains and covering agents. In particular, we study the SoCs for grid domains and metric trees covered by balls. Characterizations of their topology …
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Measuring moisture content in low hydrogen welding electrode coverings
Includes bibliographical references.
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Tropical Intersection Theory on Moduli Stack of Curve Coverings
… of tropical \'{e}tale covers (i.e., coverings of twisted tropical curves). We define the tropical intersection theory on $\mathfrac{M}_\eta^\text{trop}$ and show that the tropical intersection theory agrees with the intersection theory on the moduli stack $\bar{\mathfrac{M}}_\eta$ of …
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Restricted and Unrestricted Coverings of Complete Bipartite Graphs with Hexagons
… necessary and sufficient conditions for minimal coverings of complete bipartite graph with 6-cycles, which we call minimal unrestricted coverings. We also give necessary and sufficient conditions for minimal coverings of the complete bipartite graph with 6-cycles with the added condition the edge …
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Kaleidoscopic decomposition, classification of finite branched coverings of the sphere and path-lifting algorithms
… On the one hand, to study the finite branched coverings of the Riemann sphere, providing original contributions with regard to their structure and properties, with a particular focus on rational maps and polynomials. On the other hand, to employ the introduced theory and original results of …
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Packings and Coverings of Various Complete Digraphs with the Orientations of a 4-Cycle.
<p>There are four orientations of cycles on four vertices. Necessary and sufficient conditions are given for covering complete directed digraphs <em>D<sub>v</sub></em>, packing and covering complete bipartite digraphs, <em>D<sub>m,n</sub></em>, and packing and covering the complete digraph on …
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Decomposition, Packings and Coverings of Complete Digraphs with a Transitive-Triple and a Pendant Arc.
… are given for decompositions, packings and coverings of the complete digraph with each of the six transitive triples with a pendant arc.</p>
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Density Theorems Relative to Mean Regular Coverings and a Transformation Group in Abstract Measure Space
Made available in DSpace on 2014-12-09T22:17:48Z (GMT). No. of bitstreams: 1 6901469.pdf: 2035308 bytes, checksum: fac508c4eb8a5e0a98c3b36b4f749b9b (MD5) Previous issue date: 1968
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Decompositions, Packings, and Coverings of Complete Directed Gaphs with a 3-Circuit and a Pendent Arc.
… are given for decompositions, packings, and coverings of the complete digraph with the two 3-circuit with a pendant arc orientations.</p>
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Packings and Coverings of Complete Graphs with a Hole with the 4-Cycle with a Pendant Edge
<p>In this thesis, we consider packings and coverings of various complete graphs with the 4-cycle with a pendant edge. We consider both restricted and unrestricted coverings. Necessary and sufficient conditions are given for such structures for (1) complete graphs K<sub>v, </sub>(2) complete …
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Dermatophyte Respiration Antagonism in Vitro by Juglone
… compound in walnut tree bark and walnut coverings. | History records the use of bark and shell covering extract in Greek medicine about 200 years before Christ. During the Revolutionary War it was used to cure colonial troops suffering from dysentery and severe gastro-intestinal …
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Characterization and properties of some light-open mappings
… between Peano continua by a sequence of special coverings of the domain. We also prove some covering homotopy theorems for a certain class of finite-to-one open maps and show that a classifying space exists for maps in this class, where point inverses consist of either n points or one point, …
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Some combinatorial aspects in algebraic topology and geometric group theory
… the theory of the fundamental group and of the coverings. Finally, there are some recent problems in geometric group theory which are related to the presence of finitely presented groups which appear naturally as fundamental groups.
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Moisture properties of self-levelling flooring compounds
… concrete slabs) before applying final floor coverings. Although it is an extensively used product, only limited research has so far been published concerning their moisture properties. This report focuses on moisture properties of SLC and describes methods for determining them. Moisture …
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A Fiber Count and Caliber Spectral Study of the Cat Ulnar Nerve and Some of Its Branches
… covering only. Nerve fibers possessing both coverings are spoken of as myelinated. Fibers of the peripheral nervous system surrounded by only the neurolemma sheath are called unmyelinated. It has been reported by Duncan (’34), after observations of the dorsal and ventral spinal nerve roots of …
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Direct and Indirect Effects of Authoritarianism on Policy Preferences in Canada
… (especially the banning of religious facial coverings) and replicates previous American findings.
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The influence of curing techniques and chemical admixtures on the properties of concrete
… fogging, sprinkling, ponding, immersion and wet coverings. Sealing methods include plastic coverings and membrane forming curing compounds. Crystallising permeability reducing admixtures may be included in the concrete mix design in order to decrease the penetrability of concrete by decreasing …
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Studies of moisture and alkalinity in self-levelling flooring compounds
… substrates (mainly concrete slabs) before floor coverings are applied. Although such compounds are used extensively, only limited research on their moisture and alkali properties and their functioning in floor constructions has thus far been conducted. The aim of the present study was to …
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