EntityQ1422682· pop 21· linked from 201 articlesHadamard matrixSign in to savereal square matrix whose all columns (rows) are mutually orthogonal and which only 1 or −1 as entriesConnectionsinvertible matrixEntityblock matrixEntityquantum computingEntitymatrix multiplicationEntityadjacency matrixEntityquantum gateEntitycirculant matrixEntityband matrixEntityunimodular matrixEntitydefinite matrixEntityHadamard codeEntitymathematicsEntitygeometryEntitystatisticsEntityInternational Standard Book NumberEntitycomplex numberEntityintegerEntityreal numberEntityvolumeEntityMassachusetts Institute of TechnologyEntityCategoriesCombinatorial designMatrices (mathematics)Unsolved problems in mathematics