harvesl
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Homework Statement
Let A be an n x n matrix where n \geq 2. Show that A^{\alpha} = 0 (where A^{\alpha} is the cofactor matrix and 0 here denotes the zero matrix, whose entries are the number 0) if and only if rankA \leq n-2
Homework Equations
The Attempt at a Solution
No idea where to start with this, it's just an additional question in the lecture notes which I haven't gone through in tutorial. Thanks.