1,720,982 research outputs found
Representações parciais de grupos
Full text linkDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas.: Neste trabalho consideramos o grupo livre Fn gerado por n elementos e um conjunto L* de palavras positivas finitas que é fechado por sub-palavras e contêm o elemento neutro. Além disto fixamos um conjunto de isometrias parciais {S1,...,Sn}ÍL(H), onde H é um espaço de Hilbert e a partir destas definimos uma função S:Fn®L(H). De posse do conjunto L* e da função S consideramos três condições, que chamamos de M1, M2 e M3. Enunciamos e demonstramos um resultado que garante que S é uma Representação Parcial de Grupo quando S satisfaz as três condições acima. Finalmente apresentamos um exemplo de uma função S que satisfaz as hipóteses do resultado acima e determinamos o espectro de C*(S(r)S*(r):rÎFn)
C*-algebras of self-similar graphs over arbitrary graphs
Full text linkIn this note we extend the construction of a C*-algebra associated to a self- similar graph to the case of arbitrary countable graphs. We reduce the problem to the row-finite case with no sources, by using a desingularization process. Finally, we characterize simplicity in this case.The first-named author was partially supported by CNPq. The third named author was partially supported by PAI III grant FQM-298 of the Junta de Andalucía, and by the DGI-MINECO and European Regional Development Fund, jointly, through grants MTM2014-53644-P and MTM2017-83487-P. The third named author was partially supported by a Carleton University internal research grant
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The tight groupoid of an inverse semigroup
No full textNon UBCUnreviewedAuthor affiliation: Universidade Federal de Santa Catarina - BrazilFacult
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