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  2. Duplication and elimination matrices - Wikipedia

    en.wikipedia.org/wiki/Duplication_and...

    Download as PDF; Printable version; In other projects ... the duplication matrix and the elimination matrix are linear transformations used for transforming half ...

  3. Vectorization (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Vectorization_(mathematics)

    For a symmetric matrix A, the vector vec(A) contains more information than is strictly necessary, since the matrix is completely determined by the symmetry together with the lower triangular portion, that is, the n(n + 1)/2 entries on and below the main diagonal.

  4. List of named matrices - Wikipedia

    en.wikipedia.org/wiki/List_of_named_matrices

    Row echelon form — a matrix in this form is the result of applying the forward elimination procedure to a matrix (as used in Gaussian elimination). Wronskian — the determinant of a matrix of functions and their derivatives such that row n is the (n−1) th derivative of row one.

  5. Gaussian elimination - Wikipedia

    en.wikipedia.org/wiki/Gaussian_elimination

    If Gaussian elimination applied to a square matrix A produces a row echelon matrix B, let d be the product of the scalars by which the determinant has been multiplied, using the above rules. Then the determinant of A is the quotient by d of the product of the elements of the diagonal of B : det ( A ) = ∏ diag ⁡ ( B ) d . {\displaystyle \det ...

  6. Duplication - Wikipedia

    en.wikipedia.org/wiki/Duplication

    Duplication, or doubling, multiplication by 2; Duplication matrix, a linear transformation dealing with half-vectorization; Doubling the cube, a problem in geometry also known as duplication of the cube; A type of multiplication theorem called the Legendre duplication formula or simply "duplication formula"

  7. Which 38 Republicans voted against Trump's plan to keep the ...

    www.aol.com/38-republicans-voted-against-keeping...

    The U.S Capitol is seen after U.S, President-elect Donald Trump called on U.S. lawmakers to reject a stopgap bill to keep the government funded past Friday, raising the likelihood of a partial ...

  8. Elementary matrix - Wikipedia

    en.wikipedia.org/wiki/Elementary_matrix

    The next type of row operation on a matrix A multiplies all elements on row i by m where m is a non-zero scalar (usually a real number). The corresponding elementary matrix is a diagonal matrix, with diagonal entries 1 everywhere except in the i th position, where it is m.

  9. Macy’s is in deep trouble. It could be sitting on a gold mine

    www.aol.com/finance/macy-deep-trouble-could...

    Macy’s would be more valuable if it just shut down its business and sold everything off for parts. That’s the argument activist investment firm Barington Capital and private equity firm Thor ...