Some new near-normal sequences

Details Some new near-normal sequences Some new near-normal sequences

2009-07-17

arxiv.org/abs/0907.3129v2

International Mathematical Forum, 5, 2010, no. 32, 1559-1565

Mathematics

Combinatorics

7 pages, 1 table

Scientific paper

The normal sequences NS(n) and near-normal sequences NN(n) play an important role in the construction of orthogonal designs and Hadamard matrices. They can be identified with certain base sequences (A;B;C;D), where A and B have length n+1 and C and D length n. C.H. Yang conjectured that near-normal sequences exist for all even n. While this has been confirmed for n not exceeding 30, so far nothing else was known for larger n. We show that NN(32) consists of 8 equivalence classes and we exhibit their representatives. We also construct representatives for two equivalence classes of NN(34). On the other hand our exhaustive computer searches show that NS(31) and NS(33) are void.

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