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The non-isolatedness conjecture for two-unitary complex Hadamard matrices
Non-isolatedness conjecture. Only non-isolated complex Hadamard matrices of order $N=d^2$ provide two-unitary structures.
Conjectureopencomplex-hadamard-matrices two-unitary-matricesarXiv posted 2 days ago

The non-isolatedness conjecture for two-unitary complex Hadamard matrices