# Are there other formalisms apart from Newtonian, Lagrangian and Hamiltonian? [duplicate]

Or will there be?

In Newtonian formalism, we appoint a potential, then write newton's eq. which is equivolent to a initial value problem.

In Lagrangian formalism, we appoint a Lagrangian, then write Lagrangian eq.

In Hamiltonian formalism, we appoint a Hamiltonian, then write Hamilton-Jacobi eq.

Are other reasonable mechanisms that can generate dynamical systems?