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  2. Invertible matrix - Wikipedia

    en.wikipedia.org/wiki/Invertible_matrix

    In linear algebra, an invertible matrix is a square matrix which has an inverse.In other words, if some other matrix is multiplied by the invertible matrix, the result can be multiplied by an inverse to undo the operation.

  3. Matrix (mathematics) - Wikipedia

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

    An m × n matrix: the m rows are horizontal and the n columns are vertical. Each element of a matrix is often denoted by a variable with two subscripts.For example, a 2,1 represents the element at the second row and first column of the matrix.

  4. Matrix decomposition - Wikipedia

    en.wikipedia.org/wiki/Matrix_decomposition

    Applicable to: square, hermitian, positive definite matrix Decomposition: =, where is upper triangular with real positive diagonal entries Comment: if the matrix is Hermitian and positive semi-definite, then it has a decomposition of the form = if the diagonal entries of are allowed to be zero

  5. Diagonal matrix - Wikipedia

    en.wikipedia.org/wiki/Diagonal_matrix

    In linear algebra, a diagonal matrix is a matrix in which the entries outside the main diagonal are all zero; the term usually refers to square matrices.Elements of the main diagonal can either be zero or nonzero.

  6. Responsibility assignment matrix - Wikipedia

    en.wikipedia.org/wiki/Responsibility_assignment...

    In business and project management, a responsibility assignment matrix [1] (RAM), also known as RACI matrix [2] (/ ˈ r eɪ s i /; responsible, accountable, consulted, and informed) [3] [4] or linear responsibility chart [5] (LRC), is a model that describes the participation by various roles in completing tasks or deliverables [4] for a project or business process.

  7. Matrix management - Wikipedia

    en.wikipedia.org/wiki/Matrix_management

    A matrix organization. Matrix management is an organizational structure in which some individuals report to more than one supervisor or leader—relationships described as solid line or dotted line reporting, also understood in context of vertical, horizontal & diagonal communication in organisation for keeping the best output of product or services.

  8. Alpha Xi Delta - Wikipedia

    en.wikipedia.org/wiki/Alpha_Xi_Delta

    Alpha Xi Delta (ΑΞΔ, often referred to as A-"Zee"-D ) is a women's fraternity founded on April 17, 1893 [1] [2] at Lombard College in Galesburg, Illinois, United States. [3] Alpha Xi Delta is a member of National Panhellenic Conference (NPC), the umbrella organization of 26 national sororities. The sorority has over 171,000 initiated members ...

  9. November 11 - Wikipedia

    en.wikipedia.org/wiki/November_11

    November 11 is the 315th day of the year (316th in leap years) in the Gregorian calendar; 50 days remain until the end of the year. Events. Pre-1600. 308 – At ...