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  2. Additive inverse - Wikipedia

    en.wikipedia.org/wiki/Additive_inverse

    In mathematics, the additive inverse of an element x, denoted -x, [1] is the element that when added to x, yields the additive identity, 0. [2] In the most familiar cases, this is the number 0, but it can also refer to a more generalized zero element. In elementary mathematics, the additive inverse is often referred to as the opposite number.

  3. Moore–Penrose inverse - Wikipedia

    en.wikipedia.org/wiki/Moore–Penrose_inverse

    This implies that ⁠ + ⁠ on ⁠ ⁡ ⁠ is the inverse of this isomorphism, and is zero on (⁡). In other words: To find ⁠ A + b {\displaystyle A^{+}b} ⁠ for given ⁠ b {\displaystyle b} ⁠ in ⁠ K m {\displaystyle \mathbb {K} ^{m}} ⁠ , first project ⁠ b {\displaystyle b} ⁠ orthogonally onto the range of ⁠ A {\displaystyle A ...

  4. Integer matrix - Wikipedia

    en.wikipedia.org/wiki/Integer_matrix

    Theorems from matrix theory that infer properties from determinants thus avoid the traps induced by ill conditioned (nearly zero determinant) real or floating point valued matrices. The inverse of an integer matrix M {\displaystyle M} is again an integer matrix if and only if the determinant of M {\displaystyle M} equals 1 {\displaystyle 1} or ...

  5. Invertible matrix - Wikipedia

    en.wikipedia.org/wiki/Invertible_matrix

    This property can also be useful in constructing the inverse of a square matrix in some instances, where a set of orthogonal vectors (but not necessarily orthonormal vectors) to the columns of U are known. In which case, one can apply the iterative Gram–Schmidt process to this initial set to determine the rows of the inverse V.

  6. Negative number - Wikipedia

    en.wikipedia.org/wiki/Negative_number

    The additive inverse of a number is unique, as is shown by the following proof. As mentioned above, an additive inverse of a number is defined as a value which when added to the number yields zero. Let x be a number and let y be its additive inverse. Suppose y′ is another additive inverse of x.

  7. Inverse function - Wikipedia

    en.wikipedia.org/wiki/Inverse_function

    Sometimes, this multivalued inverse is called the full inverse of f, and the portions (such as √ x and − √ x) are called branches. The most important branch of a multivalued function (e.g. the positive square root) is called the principal branch , and its value at y is called the principal value of f −1 ( y ) .

  8. Symmetric matrix - Wikipedia

    en.wikipedia.org/wiki/Symmetric_matrix

    Similarly in characteristic different from 2, each diagonal element of a skew-symmetric matrix must be zero, since each is its own negative. In linear algebra, a real symmetric matrix represents a self-adjoint operator [ 1 ] represented in an orthonormal basis over a real inner product space .

  9. Absorbing element - Wikipedia

    en.wikipedia.org/wiki/Absorbing_element

    Zero is thus an absorbing element. The zero of any ring is also an absorbing element. For an element r of a ring R, r0 = r(0 + 0) = r0 + r0, so 0 = r0, as zero is the unique element a for which r − r = a for any r in the ring R. This property holds true also in a rng since multiplicative identity isn't required.