Abstract
This article presents an inquiry-oriented lesson for teaching Lagrange’s theorem in abstract algebra. This lesson was developed and refined as part of a larger grant project focused on how to “Orchestrate Discussions Around Proof” (ODAP, the name of the project). The lesson components were developed and refined with attention to how well they supported active and broad student participation. By guiding student exploration of a few key example groups and structuring the exploration to identify recurrent structure, students formulate key lemmas that they can combine to prove Lagrange’s theorem.
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