Editing Poncelet–Steiner theorem (section)

=== Controversies ===
While the theorem itself was not directly implicated, Jean-Victor Poncelet was involved in a plagiarism controversy with Joseph-Diez Gergonne in 1827 over duality principles in projective geometry.<ref>{{cite journal |title=Polemics in Public: Poncelet, Gergonne, Plücker, and the Duality Controversy |journal=Science in Context |date=November 11, 2015 |volume=28 |issue=4 |pages=545-585 |doi=10.1017/S0269889715000289 |url=https://www.cambridge.org/core/journals/science-in-context/article/abs/polemics-in-public-poncelet-gergonne-plucker-and-the-duality-controversy/C305E6B9326F2AC4C8AC31D4194FEDC6 |ref=Cambridge University Press}}</ref> This unrelated controversy, the accusation of which was never proven, might occasionally surface in discussions about Poncelet's broader work.