# Difference between revisions of "Dictionary:Poisson’s equation/es"

${\displaystyle {\nabla }^{2}U=4\pi \rho K,}$
where ${\displaystyle \nabla }$ is the operator del and K is a constant (the gravitational constant in the case of mass and gravitational potential). The constant 4π is deleted in some systems. In empty space where ρ=0, this becomes Laplace’s equation. Named for Simeon Denis Poisson (1781–1840), French mathematician.