# Why Johnny struggles when familiar concepts are taken to a new mathematical domain: towards a polysemous approach

## Abstract

This article is concerned with cognitive aspects of students’ struggles in situations in which familiar concepts are reconsidered in a new mathematical domain. Examples of such cross-curricular concepts are divisibility in the domain of integers and in the domain of polynomials, multiplication in the domain of numbers and in the domain of vectors, and roots in the domain of reals and in the domain of complex numbers. The article introduces a polysemous approach for structuring students’ concept images in these situations. Post-exchanges from an online forum and excerpts from an interview were analyzed for illustrating the potential of the approach for indicating possible sources of students’ misconceptions and meta-ways of thinking that might make students aware of their mistakes.

### Keywords

Concept image Conceptual change Cross-curricular concepts Epistemological obstacles Polysemy## Notes

### Acknowledgements

I am grateful to Arthur Bakker and to anonymous reviewers for their thorough criticism and insightful suggestions. I wish to thank Sze Looi Chin for proofreading.

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