Cofactor Matrix Confusion: Solving for Minor Determinants

[Wminus]

Here's a problem I am doing right now.

What are the cofactors " $\Delta_{i \alpha}$"? I know they are represent the minor of some determinant, but I am confused and can't see which determinant it is.

Also, could somebody please help me and explain why $( V_{ij} - \omega^2 T_{ij} ) \Delta_{i \alpha}$?

Thanks

 

[rumborak]

http://www.mathwords.com/c/cofactor_matrix.htm

 

[Wminus]

http://www.mathwords.com/c/cofactor_matrix.htm

It all makes sense now. Thanks :)