Description of fast matrix multiplication algorithm: 〈3×18×21:840〉
The algorithm 〈3×18×21:840〉 is the (Kronecker) tensor product of 〈1×3×7:21〉 with 〈3×6×3:40〉.
These encodings are given in compressed text format using the maple computer algebra system. In each cases, the last line could be understood as a description of the encoding with respect to classical matrix multiplication algorithm. As these outputs are structured, one can construct easily a parser to its favorite format using the maple documentation without this software.
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