**Hamiltonian (quantum Mechanics)**

In quantum mechanics, the **Hamiltonian** is the operator corresponding to the total energy of the system. It is usually denoted by *H*, also *Ȟ* or *Ĥ*. Its spectrum is the set of possible outcomes when one measures the total energy of a system. Because of its close relation to the time-evolution of a system, it is of fundamental importance in most formulations of quantum theory.

Read more about Hamiltonian (quantum Mechanics): Introduction, Schrödinger Equation, Dirac Formalism, Expressions For The Hamiltonian, Energy Eigenket Degeneracy, Symmetry, and Conservation Laws, Hamilton's Equations