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- Q7309581 subject Q7485314.
- Q7309581 abstract "In mathematics a regular Hadamard matrix is a Hadamard matrix whose row and column sums are all equal. While the order of a Hadamard matrix must be 1, 2, or a multiple of 4, regular Hadamard matrices carry the further restriction that the order be a perfect square. The excess, denoted E(H), of a Hadamard matrix H of order n is defined to be the sum of the entries of H. The excess satisfies the bound|E(H)| ≤ n3/2. A Hadamard matrix attains this bound if and only if it is regular.If n = 4u2 is the order of a regular Hadamard matrix, then the excess is ±8u3 and the row and column sums all equal ±2u. It follows that each row has 2u2 ± u positive entries and 2u2 ∓ u negative entries. The orthogonality of rows implies that any two distinct rows have exactly u2 ± u positive entries in common. If H is interpreted as the incidence matrix of a block design, with 1 representing incidence and −1 representing non-incidence, then H corresponds to a symmetric 2-(v,k,λ) design with parameters (4u2, 2u2 ± u, u2 ± u). A design with these parameters is called a Menon design.A number of methods for constructing regular Hadamard matrices are known, and some exhaustive computer searches have been done for regular Hadamard matrices with specified symmetry groups, but it is not known whether every even perfect square is the order of a regular Hadamard matrix. Bush-type Hadamard matrices are regular Hadamard matrices of a special form, and are connected with finite projective planes.Like Hadamard matrices more generally, regular Hadamard matrices are named after Jacques Hadamard. Menon designs are named after P Kesava Menon, and Bush-type Hadamard matrices are named after Kenneth A. Bush.".
- Q7309581 wikiPageWikiLink Q11007940.
- Q7309581 wikiPageWikiLink Q1422682.
- Q7309581 wikiPageWikiLink Q1475760.
- Q7309581 wikiPageWikiLink Q164425.
- Q7309581 wikiPageWikiLink Q3177104.
- Q7309581 wikiPageWikiLink Q395.
- Q7309581 wikiPageWikiLink Q7121267.
- Q7309581 wikiPageWikiLink Q7168102.
- Q7309581 wikiPageWikiLink Q7485314.
- Q7309581 wikiPageWikiLink Q751484.
- Q7309581 wikiPageWikiLink Q92704.
- Q7309581 wikiPageWikiLink Q939272.
- Q7309581 comment "In mathematics a regular Hadamard matrix is a Hadamard matrix whose row and column sums are all equal. While the order of a Hadamard matrix must be 1, 2, or a multiple of 4, regular Hadamard matrices carry the further restriction that the order be a perfect square. The excess, denoted E(H), of a Hadamard matrix H of order n is defined to be the sum of the entries of H. The excess satisfies the bound|E(H)| ≤ n3/2.".
- Q7309581 label "Regular Hadamard matrix".