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(slib.info)Determinant

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Determinant
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 - Function: determinant square-matrix
     Returns the determinant of SQUARE-MATRIX.

          (require 'determinant)
          (determinant '((1 2) (3 4))) => -2
          (determinant '((1 2 3) (4 5 6) (7 8 9))) => 0
          (determinant '((1 2 3 4) (5 6 7 8) (9 10 11 12))) => 0