Static and dynamic text : different opportunities to explore logical expansions

All texts are characterized by cohesive relations (see e.g., Halliday & Matthiessen,2014). In mathematical texts a facet of cohesion is networks of information between the various semiotic resources. A network is anchored by a central aspect introducing a theme relevant throughout an entire section of text. This anchoring expression isfollowed by different types of expansions of a concept, creating a cohesive network throughout the text. In this study, we focus on logical expansions as they express mathematical connections, and interpreting those are central to understandingmathematics. A logical expansion is expressed when a previously introduced centralaspect is justified, by a reason, condition, or comparison in another instance. The theoretical understanding of expansions has been developed from van Leeuwen’s (2005) work. When dynamic functions are introduced, new ways of representation are also introduced, which means that new ways to express logical expansions inmathematics may appear. On this basis, our aim is to explore how meaning is offeredto students via logical expansions in static and dynamic texts.