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  2. Symmetric matrix - Wikipedia

    en.wikipedia.org/wiki/Symmetric_matrix

    A complex symmetric matrix can be 'diagonalized' using a unitary matrix: thus if is a complex symmetric matrix, there is a unitary matrix such that is a real diagonal matrix with non-negative entries.

  3. Jacobi rotation - Wikipedia

    en.wikipedia.org/wiki/Jacobi_rotation

    In numerical linear algebra, a Jacobi rotation is a rotation, Q kℓ, of a 2-dimensional linear subspace of an n-dimensional inner product space, chosen to zero a symmetric pair of off-diagonal entries of an n×n real symmetric matrix, A, when applied as a similarity transformation:

  4. Transpositions matrix - Wikipedia

    en.wikipedia.org/wiki/Transpositions_matrix

    matrix is symmetric matrix. T r {\displaystyle Tr} matrix is persymmetric matrix , i.e. it is symmetric with respect to the northeast-to-southwest diagonal too. Every one row and column of T r {\displaystyle Tr} matrix consists all n elements of given vector X {\displaystyle X} without repetition.

  5. Jacobi operator - Wikipedia

    en.wikipedia.org/wiki/Jacobi_operator

    A Jacobi operator, also known as Jacobi matrix, is a symmetric linear operator acting on sequences which is given by an infinite tridiagonal matrix. It is commonly used to specify systems of orthonormal polynomials over a finite, positive Borel measure. This operator is named after Carl Gustav Jacob Jacobi.

  6. Hamiltonian matrix - Wikipedia

    en.wikipedia.org/wiki/Hamiltonian_matrix

    Download as PDF; Printable version; In other projects ... In mathematics, a Hamiltonian matrix is a 2n-by-2n matrix A such that JA is symmetric, where J is the skew ...

  7. List of planar symmetry groups - Wikipedia

    en.wikipedia.org/wiki/List_of_planar_symmetry_groups

    This article summarizes the classes of discrete symmetry groups of the Euclidean plane. The symmetry groups are named here by three naming schemes: International notation, orbifold notation, and Coxeter notation. There are three kinds of symmetry groups of the plane: 2 families of rosette groups – 2D point groups; 7 frieze groups – 2D line ...

  8. Symmetric bilinear form - Wikipedia

    en.wikipedia.org/wiki/Symmetric_bilinear_form

    Define the n × n matrix A by = (,). The matrix A is a symmetric matrix exactly due to symmetry of the bilinear form. If we let the n×1 matrix x represent the vector v with respect to this basis, and similarly let the n×1 matrix y represent the vector w, then (,) is given by :

  9. Commuting matrices - Wikipedia

    en.wikipedia.org/wiki/Commuting_matrices

    The identity matrix commutes with all matrices. Jordan blocks commute with upper triangular matrices that have the same value along bands. If the product of two symmetric matrices is symmetric, then they must commute. That also means that every diagonal matrix commutes with all other diagonal matrices. [9] [10] Circulant matrices commute.

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