MATHEMATICIAN

Lothar Collatz

1910 - 1990

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Lothar Collatz (German: [ˈkɔlaʦ]; July 6, 1910 – September 26, 1990) was a German mathematician, born in Arnsberg, Westphalia. The "3x + 1" problem is also known as the Collatz conjecture, named after him and still unsolved. The Collatz–Wielandt formula for the Perron–Frobenius eigenvalue of a positive square matrix was also named after him. Collatz's 1957 paper with Ulrich Sinogowitz, who had been killed in the bombing of Darmstadt in World War II, founded the field of spectral graph theory. Read more on Wikipedia

His biography is available in different languages on Wikipedia. Lothar Collatz is the 387th most popular mathematician (down from 362nd in 2019), the 2,384th most popular biography from Germany (up from 2,403rd in 2019) and the 43rd most popular German Mathematician.

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Among MATHEMATICIANS

Among mathematicians, Lothar Collatz ranks 387 out of 1,004. Before him are Thomas Heath, Marshall Harvey Stone, Louis Nirenberg, Thomas Simpson, Ivan Vinogradov, and Ostilio Ricci. After him are Igor Shafarevich, Richard Courant, Rudolf Lipschitz, Sergei Natanovich Bernstein, Carl Ludwig Siegel, and William George Horner.

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Contemporaries

Among people born in 1910, Lothar Collatz ranks 110. Before him are Maria Cebotari, Trygve Bratteli, John W. Campbell, Suleiman Frangieh, Ai Qing, and Jack Hawkins. After him are Giorgio Perlasca, Rudolf Kempe, Joan Bennett, Ngapoi Ngawang Jigme, Sylvester Stadler, and Kenneth E. Boulding. Among people deceased in 1990, Lothar Collatz ranks 89. Before him are Taro Kagawa, Lewis Mumford, Thorbjørn Egner, Georgy Flyorov, Peter Taylor, and Michel Leiris. After him are George de Mestral, Joan Bennett, Sergei Dovlatov, Eduard Streltsov, Peter Wessel Zapffe, and Wolfgang Schmieder.

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In Germany

Among people born in Germany, Lothar Collatz ranks 2,385 out of 7,253. Before him are Irmina of Oeren (700), Helmut Lachenmann (1935), Augustus, Grand Duke of Oldenburg (1783), Otto Braun (1900), Wilhelm Raabe (1831), and Franz Anton Maulbertsch (1724). After him are George Dzundza (1945), Ernst Wollweber (1898), Samuel Gottlieb Gmelin (1744), Johann Christoph Denner (1655), Martin Luther (1895), and Ernst Ludwig I, Duke of Saxe-Meiningen (1672).

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Among MATHEMATICIANS In Germany

Among mathematicians born in Germany, Lothar Collatz ranks 43. Before him are Gotthold Eisenstein (1823), Julius Plücker (1801), Felix Bernstein (1878), Andreas Osiander (1498), Nicholas Mercator (1620), and Michael Maestlin (1550). After him are Carl Ludwig Siegel (1896), Helmut Hasse (1898), Thomas Fincke (1561), Johann Benedict Listing (1808), Philipp Ludwig von Seidel (1821), and Elwin Bruno Christoffel (1829).

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