Minors

The minor of the elements $a_{ij}$ a of a square matrix $A$ is the determinant obtained from $∣ A ∣$ by deleting $i^{t h}$ row and $j^{t h}$ column.

Example $A = a_{1} b_{1} c_{1} a_{2} b_{2} c_{2} a_{3} b_{3} c_{3}$

$min or o f a_{1} i s t h e d e t er minan t o f t h e ma t r i x (b_{2} b_{3} c_{2} c_{3})$