Decomposition of Matrix Exponential

Theorem
Let $\mathbf A$ be a square matrix.

Let $t \in \R$ be a real number.

Let $e^{\mathbf A t}$ denote the matrix exponential of $\mathbf A$.

Let $\mathbf P$ be a non-singular matrix.

Then:
 * $e^{\mathbf P \mathbf A \mathbf P^{-1} } = \mathbf P e^{\mathbf A} \mathbf P^{-1}$

Proof
$\paren {\mathbf P \mathbf A \mathbf P^{-1} }^n = \mathbf P \mathbf A^n \mathbf P^{-1}$ by induction.