Navegando por Autor "MESSIAS, Maria Alice de Vasconcelos Feio"

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Discussões sobre a Relação entre Limite e Continuidade de uma Função: investigando Imagens Conceituais
(Universidade Federal do Pará, 2015-12) MESSIAS, Maria Alice de Vasconcelos Feio; QUARESMA, João Cláudio Brandemberg
This paper presents the results of an investigation that was made with university students enrolled in the 3rd and 4 th semester of graduation in mathematics at two public universities in the state of Pará (Brazil). We aimed to investigate the concept image of these subjects about the relation between limit and continuity of a function, through an exploratory study done in two stages. The results were related to the researches of Tall and Vinner (1981), Vinner (1991) that composed our theoretical framework. Among the evoked concept images, we emphasize the idea that when a function is not defined in one point of the domain implies, necessarily, in the non-existence of the limit of that function in that point. That is, according to them, the limit’s existence depends on the continuity of the function.
Acesso aberto (Open Access)
Um estudo exploratório sobre a imagem conceitual de estudantes universitários acerca do conceito de limite de função
(Universidade Federal do Pará, 2013-02-28) MESSIAS, Maria Alice de Vasconcelos Feio; BRANDEMBERG, João Cláudio; http://lattes.cnpq.br/3873561463033176
This is an exploratory research that aimed to investigate the elements that compose university students’ concept image related to the concept of limit of a function of one real variable. It was investigated the knowledge of 25 students of mathematics’ course in two public universities in the state of Pará (Brazil). The data collection was made, at first, through a questionnaire that contained tasks involving limit of one real variable function’s conceptual aspects. The second stage consisted in interviews with six students that were selected because of their evoked concept images in the previous stage, since they were related to the four Discussion Themes (DT) that leaded those interviews. The data analysis was based on the theory of Tall&Vinner (1981) and Vinner (1991), besides the studies of Cottril et al (1996), Jordaan (2005), Juter (2006), Nair (2009), above others, which composed the theoretical framework of this study. Above the results obtained in this research, we emphasize that the students relate the concept of limit of a function of one real variable with static and/or dynamic interpretations that, in some moments, constituted themselves as potential conflict factors, such as described by Vinner (1991). Besides, we’ve also noticed that some evoked concept images weren’t coherent, which influenced them to construct a personal concept definition different from the formal concept definition of limit of a function of one real variable.