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  1. Theory. The Vesting Clause of Article II provides, "The executive Power [of the United States] shall be vested in a President of the United States of America." Proponents of the unitary executive theory argue that this language, along with the Take Care Clause ("The President shall take care that the laws be faithfully executed ..."), creates a "hierarchical, unified executive department under ...

  2. It does this by relating changes in the state of system to the energy in the system (given by an operator called the Hamiltonian). Therefore, once the Hamiltonian is known, the time dynamics are in principle known. All that remains is to plug the Hamiltonian into the Schrödinger equation and solve for the system state as a function of time.

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