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SNOOTCHIEBOOCHEE
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Homework Statement
A square matrix A is called nilpotent if A^k =0 for some k>0. Prove that if A is nilpotent then I+A is invertible.
The Attempt at a Solution
My guess would be to do a proof by induction (on the size of the matrix)
So for the trivial cases:
Let A be a 2x2 Nilpotent matrix... thus it is of the form
[0 x] [0 0]
[0 0] Or [x 0]
Clearly when we add I to A in this case, we get get a matrix, whose det =/= 0
Im having trouble doing the more general cases, seeing as that i cannot mentally see what nilpotent matrices of a larges size look like.
Is this even the best way to approach this problem?
Any help is appreciated.