HADAMARD MATRICES H40 © Nickolay A. Balonin,Dragomir Z. Djokovic 10.01.2015

Dragomir has done the classification of PerGol of length 20. There are 34 equivalence classes. Only two of the classes contain pairs with symmetry (8,8). There is no pair having at lest one of the sequences with symmetry >8. So, nick's conjecture has been verified for order 40.

MAXIMUM SYMMETRY MATRIX  Matrices H40 with index symmetry 8,8

When v=20, in addition to Nick's example: A={0,4,6,7,9,12,13,14,16}, B={2,7,8,9,10,13,18} with symmetry (8,8), there is one more equivalence class which contains such a pair. This other pair is: A={0,4,6,7,8,9,13,14,16}, B={2,7,9,10,12,13,18}. Matrices H40 with index symmetry 5,5

The following periodic Golay pair (for v=20) A={0,1,2,3,6,9,11,13,17}, B={4,5,6,9,11,12,16} has the symmetry type (5,5) and this is true for ALL pairs in its equivalence class. This is a unique class with this property.

DRAGOMIR'S SDS-LIBRARY

EQUIVALENCE CLASSES | MATRICES H16 | MATRICES H32

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