Revistas académicas de la Universidad Católica del Norte
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Regularity of the Extensions of a Double Fuzzy Topological Space
No full textThis paper studies the regularity of the extensions of a double fuzzy topological space. The interrelations among certain families of closed sets in a double fuzzy topological space and its extensions are also investigated
Spectral analysis for finite rank perturbation of diagonal operator in non-archimedean Banach space of countable type
No full textIn this paper we are concerned with the spectral analysis for the classes of finte rank perturbations of diagonal operators in the form A = D +F where D is a diagonal operator and F is an operator of finite rank in the non archimedean Banach space of countable type. Using the theory of Fredholm operators in non archimedean setting and the concept of essential spectrum for linear operators, we compute the spectrum of A
O Dia Seguinte: Comportamentos Colectivos para a Prevencao do COVID-19 Durante a Segunda Ola
No full textBackground: In Paraguay, the manifestations of the COVID-19 pandemic (WHO, 2020) begin in March (2020) with quarantine and strict biosecurity measures. The 2nd Wave hit the country exceeding 1000 deaths per million. Objective: The study is given continuity in First. Ola (Coppari, 2020) with a second measurement of risk behaviors and protection of groups. Method: The modified "The Day After" Survey (2021) was applied, in a non-experimental, descriptive-exploratory, cross-sectional design, with n= 1292 participants where the majority of respondents were women (68.41%) from 18 to 30 years. Results: The analysis of the total variance is explained in 11 factors, and the reliability coefficient (.84) is adequate. Women have higher averages in resilient and coping behaviors compared to men. Social support-seeking behaviors are higher in religious practitioners versus non-practitioners. There is a high positive correlation between resilient and coping behaviors, and an average positive relationship (.398*) between the mentioned factors and the responsible use of information. Conclusion: The presence of a resilient response by the Paraguayan sample to the situation is concluded, assuming the required biosecurity measures.Antecedentes: En Paraguay, las manifestaciones de la pandemia de COVID-19 (OMS, 2020) inician en marzo (2020) con cuarentena y medidas estrictas de bioseguridad. La 2da Ola azotó al país superando las 1000 muertes por millón. Objetivo: Se da continuidad al estudio en 1era. Ola (Coppari, 2020) con una segunda medición de los comportamientos de riesgo y protección de los colectivos. Método: Se aplicó la Encuesta “El Día Después” modificada (2021), en un diseño no experimental, descriptivo-exploratorio, transversal, con n= 1292 participantes donde la mayoría de los encuestados fueron mujeres (68, 41%) de 18 a 30 años. Resultados: El análisis de la varianza total es explicada en 11 factores, y el coeficiente de confiabilidad (.84) es adecuado. Las mujeres presentan promedios mayores en conductas resilientes y de afrontamiento en comparación a los hombres. Las conductas de búsqueda de apoyo social son superiores en los practicantes religiosos versus no practicantes. Existe alta correlación positiva (1.000*) entre las conductas resilientes y afrontativas, y una relación media positiva (.398*) entre los factores mencionados y el uso responsable de la información. Conclusión: Se observa respuestas resilientes por parte de la muestra paraguaya ante la coyuntura, asumiendo las medidas de bioseguridad exigidas.Antecedentes: No Paraguai, as manifestações da pandemia de COVID-19 (OMS, 2020) começam em março (2020) com quarentena e medidas rigorosas de biossegurança. A 2ª Onda atingiu o país ultrapassando 1000 mortes por milhão. Objetivo: O estudo tem continuidade na Primeira. Ola (Coppari, 2020) com uma segunda medição de comportamentos de risco e proteção de grupos. Método: Se aplicó la Encuesta “El día después” modificada (2021), en un diseño no experimental, descriptivo-exploratorio, transversal, con n= 1292 participantes donde la mayoría de los encuestados fueron mujeres (68,41%) de 18 a 30 anos. Resultados: A análise da variância total é explicada em 11 fatores, e o coeficiente de confiabilidade (0,84) é adequado. As mulheres têm médias mais altas em comportamentos resilientes e de enfrentamento em comparação aos homens. Comportamentos de busca de apoio social são maiores em praticantes religiosos versus não praticantes. Existe uma correlação positiva alta (1.000*) entre comportamentos resilientes e de enfrentamento, e uma relação positiva média (0,398*) entre os fatores mencionados e o uso responsável da informação. Conclusão: Conclui-se a presença de uma resposta resiliente da amostra paraguaia à situação, assumindo as medidas de biossegurança necessárias
Stability problem in a set of Lebesgue measure zero of bi-additive functional equation
No full textLet X be a vector space and Y be a Banach space. Our aim in this paper is to investigate the Hyers-Ulam stability problem of the following bi-additive functional equation
f(x + y, s − t) + f(x − y, s + t)=2f(x, s) − 2f(y, t), x, y, s, t ∈ X,
where f : X × X → Y . As a consequence, we discuss the stability of the considered functional equation in a restricted domain and in the set of Lebesgue measure zero
Semirings of graphs: Homomorphisms and applications in network problems
No full textThis paper deals with studying some algebraic structures of the graphs as an attempt to visualize abstract mathematics. We have used some binary graph operations to investigated the algebraic structures of graphs with examples. This work emphasizes specifically the construction of semigroup or monoid and semiring, and their properties.
This manuscript also aims to give a focused introduction of a class of homomorphism on the semiring of graphs. Some instances of real-life decision problems are consequently discussed. This article is also in a nascent stage of relating number theory and graph theory through mappings
Fuzzy Sβ - continuous and fuzzy Sβ - open mappings
No full textThe goal of this paper is to introduce the notion of fuzzy mappings, known as fuzzy Sβ - continuous mappings. Some of their basic properties and characterization theorems would be investigated in fuzzy topological spaces. The notion of fuzzy Sβ - open mappings would be introduced and some of their characterization theorems and basic properties would also to be studied in fuzzy topological spaces
Near-Zumkeller numbers
No full textA positive integer n is called a Zumkeller number if the set of all the positive divisors of n can be partitioned into two disjoint subsets, each summing to σ(n)/2. In this paper, Generalizing further, near-Zumkeller numbers and k-near-Zumkeller numbers are defined and also some results concerning these numbers are established. Relations of these numbers with practical numbers are also studied in this paper
Local vertex antimagic chromatic number of some wheel related graphs
No full textLet G = (V,E) be a graph of order p and size q having no isolated vertices. A bijection ƒ : E → {1, 2, 3, ..., q} is called a local antimagic labeling if for all uv ∈ E we have w(u) ≠ w(v), the weight w(u) = ∑e∈E(u) f(e) where E(u) is the set of edges incident to u. A graph G is local antimagic if G has a local antimagic labeling. The local antimagic chromatic number χla(G) is defined to be the minimum number of colors taken over all colorings of G induced by local antimagic labelings of G. In this paper, we determine the local antimagic chromatic number for some wheel related graphs
Energy and Randić energy of special graphs
No full textIn this paper, we determine the Randić energy of the m-splitting graph, the m-shadow graph and the m-duplicate graph of a given graph, m being an arbitrary integer. Our results allow the construction of an infinite sequence of graphs having the same Randić energy. Further, we determine some graph invariants like the degree Kirchhoff index, the Kemeny’s constant and the number of spanning trees of some special graphs. From our results, we indicate how to obtain infinitely many pairs of equienergetic graphs, Randić equienergetic graphs and also, infinite families of integral graphs
Fuzzy sequential topology
No full textWe define the sequential fuzzy closure and sequential fuzzy interior of fuzzy subsets of by convergence of sequences of fuzzy points. We characterize the fuzzy sequential topology with the sequential fuzzy closure. Furthermore, we compare this topology with the usual fuzzy topology, and prove some basic properties of these concepts