TESTING QUANTUM-MECHANICS AGAINST A FULL SET OF BELL INEQUALITIES

The validity domain, within quantum mechanics, of a full set of eight Bell inequalities for four observables is determined and represented g eometrically. It turns out that the incorporation of all inequalities increases considerably the domain of invalidity. For special spin cons tellations, the validity regions become arbitrarily small. The results are compared with experiment and used to elucidate the status of the existing experimental evidence in favor of quantum theory and against hidden variables.