Germinal Pierre Dandelin

Germinal Pierre Dandelin (/ʒɛʁminˈal pjˈɛʁ dɑ̃dlˈɛ̃/, 12 April 1794 – 15 February 1847) was a French mathematician, soldier, and professor of engineering.

Life
He was born near Paris to a French father and Belgian mother, studying first at Ghent then returning to Paris to study at the École Polytechnique. He was wounded fighting under Napoleon. He worked for the Ministry of the Interior under Lazare Carnot. Later he became a citizen of the Netherlands, a professor of mining engineering in Belgium, and then a member of the Belgian army.

Work
He is the eponym of the Dandelin spheres, of Dandelin's theorem in geometry (for an account of that theorem, see Dandelin spheres), and of the Dandelin–Gräffe numerical method of solution of algebraic equations. He also published on the stereographic projection, algebra, and probability theory.