Template:Selected anniversaries/November 14
1716: Mathematician and philosopher Gottfried Wilhelm Leibniz dies. He developed differential and integral calculus independently of Isaac Newton, and designed and built mechanical calculators.
1971: Mathematician and academic Hanna Neumann dies. She contributed to group theory, co-authoring the important paper Wreath products and varieties of groups (with her husband Bernhard and eldest son Peter), and authoring the influential book Varieties of Groups.
1971: Mariner 9 enters orbit around Mars. It will map 70% of the surface, and study temporal changes in the atmosphere and surface.
2016: Steganographic analysis of Two Creatures 2 unexpectedly reveals "at least fifty kilobytes" of previously unknown Gnomon algorithm functions.
2017: Dennis Paulson celebrates forty-sixth anniversary of Mariner 9 entering orbit around Mars.