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Hadamard matrix
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===Circulant Hadamard matrices=== The circulant Hadamard matrix conjecture, however, asserts that, apart from the known 1 Γ 1 and 4 Γ 4 examples, no such matrices exist. This was verified for all but 26 values of ''u'' less than 10<sup>4</sup>.<ref>{{cite journal |first=B. |last=Schmidt |title=Cyclotomic integers and finite geometry |journal=[[Journal of the American Mathematical Society]] |volume=12 |issue=4 |pages=929β952 |year=1999 |doi=10.1090/S0894-0347-99-00298-2 |jstor=2646093 |doi-access=free |hdl=10356/92085 |hdl-access=free }}</ref>
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