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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.

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  • 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.
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