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  • Cofactors

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  • Definition of cofactor/submatrix of a matrix
  • Definition of determinant of a matrix as a cofactor expansion across the first row
  • The determinant of a matrix can be computed as a cofactor expansion across any row.
  • The determinant of a matrix can be computed as a cofactor expansion down any column.
  • The inverse of a matrix can be expressed in terms of its matrix of cofactors.
  • Cramer's rule
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