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ChainComplex ** ChainComplex -- tensor product



C**D -- the tensor product of two chain complexes.

The result, E, is a chain complex. Each module E_k in it is a direct sum of modules of the form C_i**D_j with i+j=k, and the preferred keys for the components of this direct sum are the pairs (i,j), sorted increasing values of i. For information about how to use preferred keys, see directSum.

Ways to use this method: