Heisenberg picture formulation of matrix mechanics in an arbitrary basis, in which the Hamiltonian is not necessarily diagonal. It further serves to define a third, hybrid, picture, the interaction picture. In the Heisenberg picture of quantum mechanics the state vectors, |"ψ("t")"〉, do not change with time, while observables satisfy where is the Hamiltonian and <nowiki>[•,•]</nowiki> denotes the commutator of two operators (in this case and ). Taking expectation values automatically yields the Ehrenfest theorem, featured in the correspondence principle. By the Stone–von Neumann theorem, the Heisenberg picture and the Schrödinger picture are unitarily equivalent, just a basis change in Hilbert space. In
The Tao of Physics a whole culture that subscribed to very similar ideas. Heisenberg said that this was a great help for him. Niels Bohr had a similar experience when he went to China. As a result of those influences, Bohr adopted the yin yang symbol as part of his family coat of arms when he was knighted in 1947. "The Tao of Physics" was followed by other books of the same genre like "The Hidden Connection", "The Turning Point" and "The Web of Life" in which Capra extended the argument of how Eastern mysticism and scientific findings of today relate, and how Eastern