- matrix mechanics
*noun plural but singular or plural in construction***:**a quantum mechanics based upon the application of postulates connecting frequencies and intensities of spectrum lines by the use of a matrix-involving algebra* * *

*Physics.*a formulation of non-relativistic quantum mechanics in which physical quantities are represented by matrices and matrix algebra is used to predict the outcome of physical measurements.Cf.**wave mechanics**.* * *

**matrix mechanics**,__Physics.__a formulation of quantum mechanics using spectroscopic data and matrix algebra, developed by Werner Heisenberg. It is mathematically equivalent to the theory of wave mechanics.

*Useful english dictionary.
2012.*

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