Uncertainty principle fundamental in quantum theory from "summary" of The Principles of Quantum Mechanics by P. A. M. Dirac
The uncertainty principle is of fundamental importance in quantum theory. It states that there is a limit to the precision with which certain pairs of physical quantities can be simultaneously measured. One of the most well-known formulations of the uncertainty principle is due to Heisenberg. He showed that the product of the uncertainties in the position and momentum of a particle cannot be less than a certain value, which is determined by Planck's constant. This fundamental principle has far-reaching consequences in the realm of quantum mechanics. It implies that the very act of measurement disturbs the system being measured. This disturbance cannot be avoided, no matter how advanced our measuring instruments may become. Thus, the uncertainty principle sets a fundamenta...
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