. "1948Z"^^ . . . "1948-02-07Z"^^ . "1871-11-02Z"^^ . "Poul Heegaard (November 2, 1871, Copenhagen - February 7, 1948, Oslo) was a Danish mathematician active in the field of topology. His 1898 thesis introduced a concept now called the Heegaard splitting of a 3-manifold. Heegaard's ideas allowed him to make a careful critique of work of Henri Poincar\u00E9."@en . . . "Poul Heegaard"@en . . . "1871Z"^^ . "Danish mathematician" . "Heegaard, Poul"@en .