In algebraic topology, a Postnikov square is a certain cohomology operation from a first cohomology group H1 to a third cohomology group H3, introduced by Postnikov (1949). Eilenberg (1952) described a generalization taking classes in Ht to H2t+1.
- Eilenberg, Samuel (1952), "Homotopy groups and algebraic homology theories", Proceedings of the International Congress of Mathematicians, Cambridge, Mass., 1950, vol. 2, Providence, R.I.: Amer. Math. Soc., pp. 350–353, MR 0045388
- Kharshiladze, A.F. (2001) , "p/p074070", in Hazewinkel, Michiel, Encyclopedia of Mathematics, Springer Science+Business Media B.V. / Kluwer Academic Publishers, ISBN 978-1-55608-010-4
- Postnikov, M. M. (1949), "The classification of continuous mappings of a three-dimensional polyhedron into a simply connected polyhedron of arbitrary dimension", Doklady Akademii Nauk SSSR (N.S.) (in Russian), 64: 461–462, MR 0029173
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