Roger PenroseMarcus Du SautoyMathematicsOctagonSeymour PapertAugustus De MorganGeometryQuadrilateral
Benoit Mandelbrot Nikolaj Ivanovič Lobačevskij (Nikolai Ivanovich Lobachevsky) Aleksandr Jakovlevič Chinčin (Aleksandr Yakovlevich Khinchin) Diederik Johannes Korteweg
Words in EnglishThe correct pronunciation