Definition:Change of Basis Matrix/Definition 1

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Definition

Let $R$ be a commutative ring with unity.

Let $G$ be an $n$-dimensional free $R$-module.

Let $A = \sequence {a_n}$ and $B = \sequence {b_n}$ be ordered bases of $G$.

The matrix of change of basis from $A$ to $B$ is the matrix whose columns are the coordinate vectors of the elements of the new basis $\sequence {b_n}$ relative to the original basis $\sequence {a_n}$.

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