The concept of determinant originates from the solution of linear equations. It is derived from the solution formula of binary and ternary linear equations.
Principal Diagonal: Diagonal line composed of upper left and lower right.
Subdiagonal: Another diagonal.
|a1 b1| =a1b2-a2b1
|a1 b1 c1|
|a2 b2 c2|=a1b2c3+b1c2a3+c1a2b3-a3b2c1-b3c2a1-c3a2b1
|a3 b3 c3|
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