Template:Are You Sure/October 14
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• ... that mathematician Benoit Mandelbrot (20 November 1924 – 14 October 2010) was a pioneer of fractal geometry; that he coined the word "fractal"; and that he discovered the Mandelbrot set?
• ... that mathematician Abraham Fraenkel (17 February 1891 – 15 October 1965) contributed to set theory and foundational mathematics, that he published two papers which sought to improve Ernst Zermelo's axiomatic system; and that the result is Zermelo–Fraenkel set theory?