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I'm just looking for the correct term to describe a concept:

Suppose I have a 5x5 matrix:

 A B C D E F G H I J K L M N O P Q R S T U V W X Y 

I can pick any two cells, let's say the cells I and Q, and observe that if I follow the row and column until they "collide," I get two more cells that form the corners of a submatrix. In other words, cells G and S are significant because they are on the same row/column of I and Q.

My question is this: Is there a term for the relationship between G and S in this situation? Anitpodes? Contras? Sisters?

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    @Bruno There's a reason the example is 5x5 :)2012-04-04

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Following up on the comment by Arturo Magidin

G and S are the first and last entries in the main diagonal of the submatrix determined by I and Q

I'll point out that (i) two selected entries should not be in the same row or same column; (ii) if the entries K and R are picked instead, then the corresponding pair N, P is on the secondary diagonal of the submatrix. All in all, I would say something like

the entries of $2\times 2$ submatrix containing I and Q, other than I and Q.