An important special case consists of those Hamiltonians that are quadratic forms, that is, Hamiltonians that can be written as H ( q , p ) = 1 2 ⟨ ⟨ p , p ⟩ ⟩ q where ⟨, ⟩ q is a smoothly varying inner product on the fibers T q Q, the cotangent space to the point q in the configuration space, sometimes called a cometric. This Hamiltonian consists entirely of the kinetic term.