]>
{ ∇ × B → - 1 c ∂ E → ∂ t = 4 π c j → ∇ ċ E → = 4 π ρ ∇ × E → + 1 c ∂ B → ∂ t = 0 → ∇ ċ B → = 0
R μ ν - 1 2 g μ ν R = 8 π G c 4 T μ ν