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This paper explores the relationship between students' perceptions of the type of teaching they experience in mathematics [more or less student centred] and their reported emotions, self-concept and disposition. It also addresses the question of whether there are differences in this relationship for girls and boys. It uses survey data from almost 300 year 7 Chilean students, clustered in 8 different classrooms. A correlational analysis suggests that there is a positive significant association between how student centred the teaching is perceived to be and students' more positive attitudes. Nevertheless, this effect was independent of sex, suggesting that more student-centred teching do not necessarily offer an advantage for girls, but are positive for both, boys and girls. [ABSTRACT FROM AUTHOR]

The definite integral is a central concept in the applications of calculus to experimental sciences and engineering, and consequently, a relevant didactic research topic. This paper analyses the different meanings of the definite integral by applying theoretical tools of the ontosemiotic approach to mathematical knowledge and instruction, particularly, the interpretation of meaning in terms of systems of operational and discursive practices related to the resolution of types of problems and the algebraization levels model of mathematical activity. Types of problem-situations and configurations of practices, objects, and processes are identified that allow us to characterize and articulate the various partial meanings of the definite integral (geometric-intuitive, as a limit of Riemann sums and cumulative function) as well as its extensions to the case of the double integral (as a particular case of the multiple) and the line, from the most intuitive to the most formal. The analysis allows us to identify the generality degrees of the objects of integral calculus and the role of algebra in the characterization of the meanings of the definite integral, which must be considered in the planning and management of the processes of teaching and learning of integral calculus in engineering degrees. [ABSTRACT FROM AUTHOR]