Double Circulant Codes over ℤ4 and even Unimodular Lattices
With the help of some new results about weight enumerators of self-dual codes over ℤ4 we investigate a class of double circulant codes over ℤ4, one of which leads to an extremal even unimodular 40-dimensional lattice. It is conjectured that there should be "Nine more constructions of the Leech lattice".
Calderbank, AR; Sloane, NJA
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