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Kazimierz Kuratowski

Kazimierz Kuratowski (born February 2, 1896, Warsaw, died June 18, 1980, Warsaw) was a Polish mathematician.

Among his contributions to mathematics are:

a characterization of Hausdorff spaces in terms of what are now called Kuratowski closure operators[?];
the proof of the Kuratowski-Zorn lemma
in graph theory, the characterization of planar graphs now known as the Kuratowski's theorem

Biography of Kuratowski (http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Kuratowski)

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