Task: Text Categorization
Input (English): In the A-model of topological string theory, this type of submanifold can be wrapped by a brane. For a symplectic manifold of dimension 2n, a dimension n submanifold on which the symplectic form restricts to zero is said to be this. The submanifold of positions inside a phase space of positions and momenta is of this type, and is related to the object of the same name that is a function of positions and velocities. The one that characterizes general relativity is proportional to the Ricci scalar times a volume form. Equations of motion can be derived by the variational principle from one. The action is the integral of this quantity over time. It is a Legendre transform of the Hamiltonian. For 10 points, what is this difference of kinetic and potential energy, named for an Italian-born mathematician
Output (English): Science