In mathematics, if G is a group and Π is a representation of it over the complex vector space V , then the complex conjugate representation Π is defined over the complex conjugate vector space V as follows: Π(g) is the conjugate of Π(g) for all g in G . Π is also a representation, as one may check explicitly. If g is a real Lie algebra and π is a representation of it over the vector space V , then the conjugate representation π is defined over the conjugate vector space V as follows: π(X) is the conjugate of π(X) for all X in g . π is also a representation, as one may check explicitly. If two real Lie algebras have the same complexification, and we have a complex representation of the complexified Lie algebra, their conjugate representations are still going to be different. See spinor for some examples associated with spinor representations of the spin groups Spin(p + q) and Spin(p, q) . If is a -Lie algebra (a complex Lie algebra with a * operation which is compatible with the Lie bracket), π(X) is the conjugate of −π(X) for all X in g For a finite-dimensional unitary representation, the dual representation and the conjugate representation coincide. This also holds for pseudounitary representations.