  The assumptions added by Bohr and concerning the Hilbert space (formed by all
solutions of Schroedinger equation) changed fundamentally the original physical
interpretation of these solutions proposed earlier by Schroedinger. This new
alternative was refused by Einstein on the basis of the EPR Gedankenexperiment,
but accepted fully for microscopic reality by scientific community. Both the
quantum alternatives were discussed, however, again later. Bell tried to find a
possibility how to decide between them; he generalized Einstein's
Gedankenexperiment assuming that also spins of two detected particles would be
measured. He derived then some inequality for a special combination of four
coincidence probabilities, and it was commonly assumed that his inequality held
for the original Schroedinger interpretation but not in Bohr's Copenhagen
quantum mechanics; without any actual proof having been given. Corresponding
experiments were proposed and finished in 1982. The violation of Bell's
inequality was then interpreted as decisive victory of Bohr's theory. However,
it will be shown that Bell's inequality has been interpreted mistakenly. It has
been based always on some assumption that does not hold in any probabilistic
theory (i.e., in the given spin experiment) but only in deterministic classical
theory. There is not any argument for preferring the Copenhagen quantum
mechanics and against Einstein's critical standpoint. Some other consequences
will be mentioned, too.
