#matrix_operation  a mathematical operation involving matrices
  supertype:  mathematical_process__mathematical_operation__operation  calculation by mathematical methods; "the problems at the end of the chapter demonstrated the mathematical processes involved in the derivation"; "they were learning the basic operations of arithmetic"
  subtype:  matrix_addition  the addition of matrices
  subtype:  matrix_multiplication  the multiplication of matrices
  subtype:  matrix_inversion  determination of a matrix that when multiplied by the given matrix will yield a unit matrix

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