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2. Preconditioner - Wikipedia

   en.wikipedia.org/wiki/Preconditioner

   In linear algebra and numerical analysis, a preconditioner of a matrix is a matrix such that has a smaller condition number than . It is also common to call T = P − 1 {\displaystyle T=P^{-1}} the preconditioner, rather than P {\displaystyle P} , since P {\displaystyle P} itself is rarely explicitly available.

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4. Transformation matrix - Wikipedia

   en.wikipedia.org/wiki/Transformation_matrix

   In other words, the matrix of the combined transformation A followed by B is simply the product of the individual matrices. When A is an invertible matrix there is a matrix A −1 that represents a transformation that "undoes" A since its composition with A is the identity matrix. In some practical applications, inversion can be computed using ...

5. Moore–Penrose inverse - Wikipedia

   en.wikipedia.org/wiki/Moore–Penrose_inverse

   A matrix satisfying only the first of the conditions given above, namely + =, is known as a generalized inverse. If the matrix also satisfies the second condition, namely + + = +, it is called a generalized reflexive inverse. Generalized inverses always exist but are not in general unique.

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