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The Thirteen Books of Euclid's Elements, Books 1 and 2
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In this paper, we describe how we captured and investigated incidence reasoning in Hilbert's Foundations of Geometry by using a new discovery tool integrated into an interactive proof assistant. Our tool exploits concurrency, inferring facts independently of the user with the incomplete proof as a guide. It explores the proof space, contributes tedious lemmas and discovers alternative proofs. We show how this tool allowed us to write readable formalised proof-scripts that correspond very closely to Hilbert's prose arguments.