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Programa de Pós-Graduação em Matemática (PGMAT)

Programa de Pós-Graduação em Matemática (PGMAT)

Submissões recentes

  • Antunes, Gleberson Gregorio da Silva; https://lattes.cnpq.br/7793947609844319 (UNIVERSIDADE FEDERAL DA BAHIAPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2026-02-24)
    A Dunford–Pettis operator is a linear operator that maps weakly convergent sequences into norm-convergent sequences. This work investigates the properties of positive operators defined on Banach lattices, with an emphasis ...
  • Azevedo, Arthur Rios de; https://orcid.org/0000-0002-9154-2133; https://lattes.cnpq.br/7147796523952771 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2025-12-18)
    Research aimed at estimating causal effects of interventions on time-to-event outcomes in observational studies faces challenges, notably when the goal is to compare groups in the presence of confounding. Propensity ...
  • Reis, Gábrio Ravel Souza; http://lattes.cnpq.br/4574772254962424 (Universidade Federal da BahiaDepartamento de Matemática (DMA) UFBABrasilInstituto de Matemática, 2025-08-25)
    This work investigates how the fractal geometry of a space influences the speed at which orbits return to small neighborhoods of their initial points. The object of study is a dynamical system that preserves a probability ...
  • Pereira, Ivalbert dos Santos; http://lattes.cnpq.br/7796884613795107 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2025-06-30)
    We are experiencing an increasing development and adoption of statistical learning models (or machine learning) frameworks. Additionally, the vast amounts of data used for training can have unintended effects concerning ...
  • Santos, George Anderson Alves dos; http://lattes.cnpq.br/2238124102978748 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2025-08-28)
    Reliability and maintenance have become crucial in industrial systems, leading to the develop ment of associated theories and methodologies. In a globalized and highly competitive market, producing highly reliable products ...
  • Sá, Italo Estrela de Souza; https://orcid.org/0009-0000-6269-0279; https://lattes.cnpq.br/3753073582407754 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2025-08-27)
    Measuring the impact of public policies requires identifying the specific effect of an intervention on a given outcome, isolating it from external and confounding influences. This study proposes an evaluation of the Bolsa ...
  • Mota, João Roberto Figueiredo de Almeida; http://lattes.cnpq.br/2505790542609260 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2025-07-29)
    In this work, we define the invariant Σ₁ of finitely generated groups. We compute this invariant in the case of the Total and Pure Braid Groups of the Torus. To develop the theory and its application, an in-depth study of ...
  • Boaventura, Brenda Lima; https://lattes.cnpq.br/2536907206027012 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2025-08-07)
    Logistic Regression (LR) is widely used in credit risk assessment as it models the relationship between a binary response variable and a set of predictors. However, the traditional application of this technique overlooks ...
  • Silva, Angela Lima da; https://lattes.cnpq.br/1582007949170364 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2025-07-18)
    Studies have shown that certain survival datasets are not adequately represented by the proportional hazards model proposed by Cox (1972), highlighting the need for alternative approaches that accommodate non-proportional ...
  • Silva, Wanessa Muricy; http://lattes.cnpq.br/1370020629163620 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2025-07-24)
    In this master’s dissertation, we characterize the most general one-dimensional Brownian motion under some Markovian behavior at zero via the study of its infinitesimal generators. The class of processes here considered ...
  • Silva, Izamara Ferreira; http://lattes.cnpq.br/9705361024665448 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2025-08-25)
    Let K be an infinite field of characteristic , 2, E is the infinite-dimensional Grassmann algebra over this field, and φ is an involution on E. Based primarily on [1], in this work, we present a description of the sets ...
  • Vieira, Lucas Santos; http://lattes.cnpq.br/7341032141646178 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2024-02-26)
    Beta and Simplex regression models have been widely used to analyze variables that represent rates, proportions or index, that is, variables measurable in the open interval (0.1). In some phenomena these variables are ...
  • Almeida, Rafael Toledo Costa de; https://orcid.org/0000-0002-4731-7975; http://lattes.cnpq.br/2192564435787089 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2025-04-22)
    In survival analysis, the primary interest is often the time until the occurrence of a single event; however, there are situations where interest lies in multiple events, and the occurrence of one event precludes the ...
  • Silva, Kim Leone Souza da; https://orcid.org/0009-0003-0609-4167; http://lattes.cnpq.br/4234453341183971 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2024-12-06)
    The human impact on the planet is evident, and the need to mitigate these effects is becoming increasingly urgent. Atmospheric pollution, for example, is intrinsically linked to the environment and human health. Particulate ...
  • Almeida, Ugo Coutinho Monteiro; http://lattes.cnpq.br/6218495529266423 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2025-09-05)
    The Leibniz hierarchy constitutes a classification system for propositional logics based on the behavior of the Leibniz operator associated to each logic, which is one of the main subjects of interest pertaining to the ...
  • Dias, Marcelo Oliveira; http://lattes.cnpq.br/9162004009334526 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2025-03-13)
    In this dissertation, we will adress recent developments in the theory of topological cardinal invariants, as well as their motivations from classical results. We will introduce the elementary submodels, a tool that is ...
  • Rocha Neto, Carlos Nascimento; http://lattes.cnpq.br/0905202579365283 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2025-04-08)
    The main objective of this work is to investigate and prove the existence and stability of a family of exponential pullback attractors for a class of non-autonomous reaction-diffusion equations with nonlinearity fulfilling ...
  • Oliveira, João Mark Souza; http://lattes.cnpq.br/9885399083014377 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2025-02-04)
    The simplest analytical approach to model the propagation of wildfires considers that the velocity space is represented by an indicatrix at each point. Since then, elliptic modeling has been widely accepted. In A general ...
  • Eustorgio Filho, Marcos Aurélio; https://orcid.org/0000-0003-4596-5896; http://lattes.cnpq.br/0006073382117233 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2024-10-31)
    Distal outcomes models encompass methods for estimating the impact of latent variables on observed outcomes while accounting for other predictors, increasing the mathematical complexity of the models. Recent techniques aim ...
  • Morales, Gabriel Andrés Borges; https://lattes.cnpq.br/0161797957664460 (Universidade Federal da BahiaPós-Graduação em Matemática (PGMAT) UFBABrasilInstituto de Matemática, 2024-11-21)
    Weshall prove that the Julia set Jc is asymptotically similar to the Mandelbrot set M about a Misiurewicz parameter c, using the concept of similarity and the Hausdorff-Chabauty distance. This result was originally proved ...

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