Well, I confess my forgetfulness; but what historian, who ever gets free from mere antiquarism, can help forgetting? A modern realism surely does no greater violence to history than antiquarism.

The exponential of an operator gives the exponential mapping H↦exp(H)=∑Hᵏ/k! of the space of Hamiltonian operators to the symplectic group. The symplectic group acts by conjugation on itself and on its Lie algebra.

Oh, so that's how it works.

She gave birth to dicephalous conjoined twins