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  2. Mexican peso - Wikipedia

    en.wikipedia.org/wiki/Mexican_peso

    USD/MXN exchange rate. Mexican peso crisis in 1994 was an unpegging and devaluation of the peso and happened the same year NAFTA was ratified. [2]The Mexican peso (symbol: $; currency code: MXN; also abbreviated Mex$ to distinguish it from other peso-denominated currencies; referred to as the peso, Mexican peso, or colloquially varo) is the official currency of Mexico.

  3. Matrix multiplication - Wikipedia

    en.wikipedia.org/wiki/Matrix_multiplication

    This article will use the following notational conventions: matrices are represented by capital letters in bold, e.g. A; vectors in lowercase bold, e.g. a; and entries of vectors and matrices are italic (they are numbers from a field), e.g.

  4. Matrix (mathematics) - Wikipedia

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

    Likewise, inverses of triangular matrices are algorithmically easier to calculate. The Gaussian elimination is a similar algorithm; it transforms any matrix to row echelon form . [ 51 ] Both methods proceed by multiplying the matrix by suitable elementary matrices , which correspond to permuting rows or columns and adding multiples of one row ...

  5. Row and column spaces - Wikipedia

    en.wikipedia.org/wiki/Row_and_column_spaces

    The row vectors of a matrix.The row space of this matrix is the vector space spanned by the row vectors. The column vectors of a matrix.The column space of this matrix is the vector space spanned by the column vectors.

  6. QR decomposition - Wikipedia

    en.wikipedia.org/wiki/QR_decomposition

    More generally, we can factor a complex m×n matrix A, with m ≥ n, as the product of an m×m unitary matrix Q and an m×n upper triangular matrix R.As the bottom (m−n) rows of an m×n upper triangular matrix consist entirely of zeroes, it is often useful to partition R, or both R and Q:

  7. Mexican peso crisis - Wikipedia

    en.wikipedia.org/wiki/Mexican_peso_crisis

    USD/MXN exchange rate Mexico inflation rate 1970-2022. The Mexican peso crisis was a currency crisis sparked by the Mexican government's sudden devaluation of the peso against the U.S. dollar in December 1994, which became one of the first international financial crises ignited by capital flight.

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  9. 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