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  2. Matrix multiplication - Wikipedia

    en.wikipedia.org/wiki/Matrix_multiplication

    Matrix multiplication shares some properties with usual multiplication. However, matrix multiplication is not defined if the number of columns of the first factor differs from the number of rows of the second factor, and it is non-commutative, [10] even when the product remains defined after changing the order of the factors. [11] [12]

  3. Matrix multiplication algorithm - Wikipedia

    en.wikipedia.org/wiki/Matrix_multiplication...

    Matrix multiplication completed in 2n-1 steps for two n×n matrices on a cross-wired mesh. There are a variety of algorithms for multiplication on meshes . For multiplication of two n × n on a standard two-dimensional mesh using the 2D Cannon's algorithm , one can complete the multiplication in 3 n -2 steps although this is reduced to half ...

  4. Matrix (mathematics) - Wikipedia

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

    It is called an identity matrix because multiplication with it leaves a matrix unchanged: = = for any m-by-n matrix A. A nonzero scalar multiple of an identity matrix is called a scalar matrix. If the matrix entries come from a field, the scalar matrices form a group, under matrix multiplication, that is isomorphic to the multiplicative group ...

  5. Companion matrix - Wikipedia

    en.wikipedia.org/wiki/Companion_matrix

    These matrices are related as follows. The following statements are equivalent: A is similar over F to (), i.e. A can be conjugated to its companion matrix by matrices in GL n (F); the characteristic polynomial () coincides with the minimal polynomial of A, i.e. the minimal polynomial has degree n;

  6. Identity matrix - Wikipedia

    en.wikipedia.org/wiki/Identity_matrix

    When is an matrix, it is a property of matrix multiplication that = =. In particular, the identity matrix serves as the multiplicative identity of the matrix ring of all n × n {\displaystyle n\times n} matrices, and as the identity element of the general linear group G L ( n ) {\displaystyle GL(n)} , which consists of all invertible n × n ...

  7. Cramer's rule - Wikipedia

    en.wikipedia.org/wiki/Cramer's_rule

    Consider a system of n linear equations for n unknowns, represented in matrix multiplication form as follows: = where the n × n matrix A has a nonzero determinant, and the vector = (, …,) is the column vector of the variables. Then the theorem states that in this case the system has a unique solution, whose individual values for the unknowns ...

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