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Max Dehn: Quick Facts

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Born November 13, 1878 • Hamburg • Germany • (Born on this day)
Died June 27, 1952 (aged 73) • North Carolina
Subjects Of Study Dehn’s lemma
August Ferdinand Möbius, detail from an engraving by an unknown artist.
August Ferdinand Möbius
German mathematician and astronomer
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Alexandre Grothendieck
German-French mathematician
Henri Poincaré, 1909.
Henri Poincaré
French mathematician
Aleksandrov, Pavel Sergeevich
Pavel Sergeevich Aleksandrov
Soviet mathematician
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Oswald Veblen
American mathematician
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Stephen Smale
American mathematician
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Luitzen Egbertus Jan Brouwer
Dutch mathematician
Sierpiński gasketPolish mathematician Wacław Sierpiński described the fractal that bears his name in 1915, although the design as an art motif dates at least to 13th-century Italy. Begin with a solid equilateral triangle, and remove the triangle formed by connecting the midpoints of each side. The midpoints of the sides of the resulting three internal triangles are connected to form three new triangles that are then removed to form nine smaller internal triangles. The process of cutting away triangular pieces continues indefinitely, producing a region with a Hausdorf dimension of a bit more than 1.5 (indicating that it is more than a one-dimensional figure but less than a two-dimensional figure).
Wacław Sierpiński
Polish mathematician
Sir Michael Francis Atiyah, 2004
Sir Michael Francis Atiyah
British mathematician
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Simon Donaldson
British mathematician
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Sergei Novikov
Russian mathematician
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Saunders Mac Lane
American mathematician
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William Paul Thurston
American mathematician
Michael Freedman
Michael Freedman
American mathematician
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René Frédéric Thom
French mathematician
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Enrico Betti
Italian mathematician
Pontryagin, Lev Semyonovich
Lev Semyonovich Pontryagin
Russian mathematician
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James W. Alexander II
American mathematician
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Henry Whitehead
British mathematician
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Jean Dieudonné
French mathematician

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