c u t ( x , θ , t ) + θ ⋅ ∇ u ( x , θ , t ) = − μ ( x ) u ( x , θ , t ) + s ( x ) ∫ S n − 1 u ( x , θ ′ , t ) σ ( θ , θ ′ ) d θ ′
Boltzmann Equation for Moving Particles
special version of the Boltzmann equation for moving particles