The paper discusses four approaches to the biextension of Chow groups and their equivalences. These are the following: an explicit construction given by S. Bloch, a construction in terms of the Poincaré biextension of dual intermediate Jacobians, a construction in terms of K-cohomology, and a construction in terms of determinant of cohomology of coherent sheaves. A new approach to J. Franke's Chow categories is given. An explicit formula for the Weil pairing of algebraic cycles is obtained.
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