Mixing
Prove that the rank of $(1-I)$ is $n$
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The rank of $(1-I_n)$, where $1$ is the $n times n$ all-1 matrix and $I_n$ the $n times n$ identity matrix, seems to be $n$. How to prove this concisely?
linear-algebra matrices
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edited Jun 20 '13 at 18:57
Davide Giraudo
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asked Jun 20 '13 at 18:02
ranky ranky
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