Classification of base sequences BS(n+1,n)

Details Classification of base sequences BS(n+1,n) Classification of base sequences BS(n+1,n)

2010-02-06

arxiv.org/abs/1002.1414v3

International Journal of Combinatorics, Volume 2010, Article ID 851857, 21 pages

Mathematics

Combinatorics

27 pages, 7 tables. Final version. To appear in the International Journal of Combinatorics.

Scientific paper

Base sequences BS(n+1,n) are quadruples of {1,-1}-sequences (A;B;C;D), with A and B of length n+1 and C and D of length n, such that the sum of their nonperiodic autocorrelation functions is a delta-function. The base sequence conjecture, asserting that BS(n+1,n) exist for all n, is stronger than the famous Hadamard matrix conjecture. We introduce a new definition of equivalence for base sequences BS(n+1,n) and construct a canonical form. By using this canonical form, we have enumerated the equivalence classes of BS(n+1,n) for n <= 30. Due to excessive size of the equivalence classes, the tables in the paper cover only the cases n <= 13.

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