= Coercive energy estimate for kinetic transport
{title2=$\|f(t_2)\|_2\leq e^{-\delta(t_2-t_1)}\|f(t_1)\|_2$}
If a velocity operator satisfies $\operatorname{Re}\langle Lh,h\rangle\geq\delta\|h\|_2^2$, then sufficiently regular solutions of $\partial_tf+v\cdot\nabla_xf+Lf=0$ obey the displayed estimate when spatial boundary fluxes vanish. The free-transport part contributes zero to the energy <derivative>. Integrating the resulting differential inequality avoids dividing by a possibly zero <norm>.
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