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double dot A:B between two tensors

Description

\[ (A:B)_{i_1,\ldots,j_n,j_1,\ldots,j_m} = \sum_{k,l} A_{i_1,\ldots,i_n,k,l} B_{k,l,j_1,\ldots,j_m} \]

Syntax

C = A:B