Template:Selected anniversaries/August 13
1863: Artist Eugène Delacroix dies. His use of expressive brushstrokes and his study of the optical effects of color will shaped the work of the Impressionists.
1899: Mathematician, economist, and crime-fighter Joseph Louis François Bertrand publishes new class of Gnomon algorithm functions based on probability theory, economics, thermodynamics. These functions will soon find widespread application in predicting and preventing crimes against mathematical constants.
1903: Physicist and mathematician Sir George Stokes, 1st Baronet born. He will make seminal contributions to fluid dynamics (including the Navier–Stokes equations) and to physical optics.
2017: Time-travelling physician-warrior Asclepius Myrmidon discovers unregistered halting problem, predicts emergence of crimes against mathematical constants.