Mathematic Teachers' Specialized Knowledge about Infinity

Abstract

Infinity is a concept underlying many concepts present in school mathematics. In this article, we explore teachers' knowledge about infinity from the perspective of the professional knowledge, which is used to deal with infinity in a classroom. For that purpose, we use the discussion of vignettes of simulated situations where different kinds of understandings of infinity are present. We will use the MTSK model to have a detailed insight of that knowledge, showing that knowing infinity, in a specialized sense, means knowing it both, from a mathematical and didactical perspective.

Keywords:
MTSK; Infinity; Professional Knowledge; MKT; Vignettes