The uncertainty relations revisited

Abstract

In his book, The Character of Physical Law, Richard Feynman mentions there was a time in the early days of Einstein's theory of relativity when it was said that only twelve people understood relativity, although this might have been an exaggeration, but as far as quantum mechanics is concerned "nobody understands quantum mechanics." Einstein himself died complaining that the theory behind it is incomplete.
The problem arises with the indeterminacy principle of Werner Heisenberg in 1927, in spite of the Copenhagen interpretation of quantum mechanics. David Bohm thought he could remedy the situation by looking for some hidden variables which, if found, would make quantum theory complete, but John Bell of CERN in 1964 what is known as Bell's inequality which, if violated by experiments, tends to show that the theory is complete. Many, however, disagree.