How can I calculate the formula of $ \dim( N([T]_B))$?

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given vector space $V$ so that $\dim(V)$ is finite , base $B$ to $V$, and linear-transformation $T:V \to V$.

How can I calculate the formula of $ \dim( N([T]_B))$?

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Note that for Rank–nullity theorem, the dimension of the Null space is

$$\dim( N([T]_B))=\dim V-\text{rank} [T]_B$$