Change of Basis Matrix from Basis to Itself is Identity
(Redirected from Change of Basis Matrix Between Equal Bases)
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Theorem
Let $R$ be a ring with unity.
Let $M$ be a free $R$-module of finite dimension $n > 0$.
Let $\BB$ be an ordered basis of $M$.
Then the change of basis matrix from $\BB$ to $\BB$ is the $n\times n$ identity matrix:
- $\mathbf M_{\BB, \BB} = \mathbf I$
Proof
Follows directly from the definition of change of basis matrix.
$\blacksquare$