My purpose in this paper is to present a didactic tool – a set of specially designed problems and questions for discussion
– that can help making students better aware of the various aspects of the formal notion of limit of a sequence. The didactic
tool will be justified using results from my own and other authors' research on students' naïve or erroneous conceptions of
limit of a sequence.
Keywords convergence of a sequence - didactic tool - learning - limit of a sequence - secondary school - teaching