Template:Selected anniversaries/September 13
1592: Philosopher and author Michel de Montaigne dies. He was one of the most significant philosophers of the French Renaissance, known for popularizing the essay as a literary genre.
1861: Mathematician Dmitry Mirimanoff born. In 1917, he will introduce the cumulative hierarchy of sets and the notion of von Neumann ordinals; although he will introduce a notion of regular (and well-founded set) he will not consider regularity as an axiom, but also explore what is now called non-well-founded set theory, and the idea of what is now called bisimulation.
1873: Mathematician and author Constantin Carathéodory born. He will pioneer the axiomatic formulation of thermodynamics along a purely geometrical approach.
1898: Priest and inventor Hannibal Goodwin patents celluloid photographic film.