"The linear discriminant analysis (LDA) technique in the study of the chemical composition of primary cosmic rays in a phenomenological parameterization of the longitudinal profile of extensive atmospheric showers" (master's degree). Candidate: Clewton Luís Ferreira da Fonseca. Advisor: professor José Augusto Chinellato. December 19, 2017, at 14 pm, in the IFGW Postgraduate auditorium.