One of Maxwell’s equations says that ∇ × E=−∂B/∂t (in SI units), where E and B are the electric and magnetic fields. This is a geometric relationship between geometric objects; it requires no coordinates or basis for its statement. By integrating this equation over a 2-dimensional surface ν₂ with boundary curve ∂ν₂ and applying Stokes’ theorem, derive Faraday’s law of induction—again, a geometric relationship between geometric objects.