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Dmitri Faddeev (Russian: Дми́трий Константи́нович Фадде́ев) was a Russian mathematician working in Galois theory, group cohomology, and numerical linear algebra. He is the father of Ludwig Faddeev.
He discovered group cohomology independently of Eilenberg and MacLane; the publication of his first paper on this subject was delayed till 1947 because of World War II.
On group cohomology: