# matrix mechanics

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Related to matrix mechanics: wave mechanics

## matrix mechanics:

see quantum theory**quantum theory,**

modern physical theory concerned with the emission and absorption of energy by matter and with the motion of material particles; the quantum theory and the theory of relativity together form the theoretical basis of modern physics.

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## Matrix mechanics

A formulation of quantum theory in which the operators are represented by time-dependent matrices. Matrix mechanics is not useful for obtaining quantitative solutions to actual problems; on the other hand, because it is concisely expressed in a form independent of special coordinate systems, matrix mechanics is useful for proving general theorems.

## matrix mechanics

[′mā·triks mə′kan·iks] (quantum mechanics)

The theory of quantum mechanics developed by using the Heisenberg picture and representing operators by their matrix elements between eigenfunctions of the Hamiltonian operator; Heisenberg's original formulation of quantum mechanics.