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James W. Alexander II
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Alexander's horned sphere, Jordan curve theorem, mathematics, James W. Alexander II
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James W. Alexander II: Facts & Related Content

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Facts

Also Known As James Waddell Alexander II
Born September 19, 1888 • New Jersey
Died September 23, 1971 (aged 83) • Princeton • New Jersey
Subjects Of Study topology

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Alexander's horned sphere, Jordan curve theorem, mathematics, James W. Alexander II
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Oswald Veblen
American mathematician
Stephen Smale
American mathematician
Saunders Mac Lane
American mathematician
William Paul Thurston
American mathematician
Michael Freedman
Michael Freedman
American mathematician
Daniel Gray Quillen
American mathematician
Henri Poincaré, 1909.
Henri Poincaré
French mathematician
Aleksandrov, Pavel Sergeevich
Pavel Sergeevich Aleksandrov
Soviet mathematician
Luitzen Egbertus Jan Brouwer
Dutch mathematician
August Ferdinand Möbius, detail from an engraving by an unknown artist.
August Ferdinand Möbius
German mathematician and astronomer
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
Alexandre Grothendieck
German-French mathematician
Simon Donaldson
British mathematician
Sergei Novikov
Russian mathematician
René Frédéric Thom
French mathematician
Enrico Betti
Italian mathematician
Pontryagin, Lev Semyonovich
Lev Semyonovich Pontryagin
Russian mathematician
Henry Whitehead
British mathematician
Jean Dieudonné
French mathematician

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