Two classes of Hadamard matrices of Goethals-Seidel type

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arxiv 2404.14375 v3 pith:GNFLTMPY submitted 2024-04-22 math.CO

Dragomir Ž. {DJ}oković This is my paper · ORCID

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keywords classesmatricesgoethals-seidelhadamardtypeconstructintroducemany

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We introduce two classes of Hadamard matrices of Goethals-Seidel type and construct many matrices in these classes.

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A database of constructions of Hadamard matrices
math.CO 2024-11 conditional novelty 6.0 of 10

A verified SageMath database now constructs all known Hadamard matrices up to order 1208, corrects the skew Hadamard order 292, updates over 100 table entries, and proves Paley constructions fail for order 2^m times 509203.