retract
He continued to study for his doctorate, under the supervision of Mazurkiewicz, and this was awarded in 1930 for his dissertation Sur les rétractes (published in 1931) in which he invented the theory of retracts. | Continuó sus estudios para su doctorado, bajo la supervisión de Mazurkiewicz, y este fue concedido en 1930 por su disertación Sur les rétractes (publicado en 1931) en el que inventó la teoría de la retrae. |
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