Determinants
The determinant of a matrix A is also sometimes denoted by |A|.
This notation can be ambiguous since it is also used for certain matrix norms and for the absolute value. However,
often the matrix norm will be denoted with double vertical bars (e.g.,
‖A‖) and may carry a subscript as well. Thus, the vertical bar notation
for determinant is frequently used (e.g., Cramer's rule and minors). For example, the matrix
has a determinant det(A) indicated by | A | or more explicitly as
