Jacobi's theorem

Jacobi's theorem can refer to:
 * Maximum power theorem, in electrical engineering
 * The result that the determinant of skew-symmetric matrices with odd size vanishes, see skew-symmetric matrix
 * Jacobi's four-square theorem, in number theory
 * Jacobi's theorem (geometry), on concurrent lines associated with any triangle
 * Jacobi's theorem on the normal indicatrix, in differential geometry
 * Jacobi's theorem on conjugate points, in differential geometry