Abstract
We show that the Smith normal form of every skew-Hadamard matrix of order 4m is diag[1,2,...,2, 2m,...,2m,4m]
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References
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Michael, T.S., Wallis, W.D. Skew-Hadamard Matrices and the Smith Normal Form. Designs, Codes and Cryptography 13, 173–176 (1998). https://doi.org/10.1023/A:1008230429804
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DOI: https://doi.org/10.1023/A:1008230429804