
#1
Feb211, 04:33 PM

P: 16

If given a n*n matrix with all rows and columns sum to 0, how do I argue that all its (n1)*(n1) minor have the same determinant up to a sign?
Since all rows and columns all sum to 0, then I know that any column is a linear combination of all others, so that the determinant of this n*n matrix must be zero, then since the determinant is calculated using minors, it seems to imply that all (n1)*(n1) minors must have the same determinant up to a sign, but how do I rigorously prove that? 



#2
Feb211, 10:46 PM

P: 234

This is just a hunch, but cofactor expansion and induction are probably involved.



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