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**relation between "commutation" and "quantization"**

Hi people;

Over the several texts I have read, I got the impression that position-momentum commutation relations is the cause of "quantization" of the system. Or, they are somehow fundamentally related.

The only relation I know of, is to derive the momentum operator in position space, [itex]-i\hbar\frac{d}{dx}[/itex], from the commutation relation [itex][x,p]=i\hbar[/itex], and then find the position and momentum eigenfunctions which turn out to be oscillating functions of [itex]x[/itex] and [itex]p[/itex]. Then, eigenvalue spectrum of these operators are then naturally "quantized", BUT only if the potential is bounding, like box, harmonic oscillator etc..

Now this demonstration of relation between commutation and quantization looks quite "indirect" to me, and also it is conditional (a bounding potential required to get quantized eigenvalues).

So my question is; is there a more fundamental demonstration of the relation between commutation relations and quantization of a system.

Thanks in advance for the answers.

Deniz