Poncelet (Marie Poncelet)

Marie Poncelet was a mathematician known for Poncelet's theorem, a principle in geometry. It states that if a polygon can be inscribed in one conic (like an ellipse) and simultaneously circumscribed around another conic, then a similar polygon can be constructed starting from any point on the outer conic, and this process repeats indefinitely. Essentially, it reveals a remarkable regularity and connection between inscribed and circumscribed polygons in conic figures, illustrating deep properties of projective and Euclidean geometry.