Solution
= Solution
The three Cartesian contributions to the <divergence> are $2(y+z)$, $-2y$, and $-2z$. Hence
$$
\boxed{\nabla\cdot\mathbf v=2(y+z)-2y-2z=0}.
$$
= Solution
The three Cartesian contributions to the <divergence> are $2(y+z)$, $-2y$, and $-2z$. Hence
$$
\boxed{\nabla\cdot\mathbf v=2(y+z)-2y-2z=0}.
$$