Abstract
We give a new proof of a special case of a theorem Hopkins and the authors, relating the Morava K-theory of BU〈6〉 to the theory of cubical structures on formal groups. In the process we relate the Morava K-theory of the Eilenberg-MacLane space K( Z,3) to the theory of Weil pairing, and we appeal to results of algebraic geometers about biextensions.
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