The Principle of Relativity

by Albert Einstein; H. Minkowski

(5) ρ´ = ρ [(-qu_z + 1)/√(1 - q²)],

ρ´u_z´ = ρ[(u_z - q)/√(1 - q²)],

ρ´u_x´ = ρu_x,

ρ´u_y´ = ρu_y.

(6) e´_x´ = (e_x - qm_y)/(√(1 - q²)),

m´_r´ = (qe_x + m_y)/(√(1 - q²)),

e´_z´ = e_z.

(7) m´_x´ = (m_x - qe_y)/(√(1 - q²)),

e´_y´ = (qm_x + e_y)/(√(1 - q²)),

m´_z´ = m_z.