  The Gedankenexperiment advanced by Frauchiger and Renner in their "Nature"
paper was based on an implicit assumption that one can synchronize stochastic
measurement intervals between two non-interacting systems. This hypothesis, the
author demonstrates, is equivalent to the complete entanglement of these
systems. Consequently, Frauchiger and Renner's postulate Q is meaningless and
needs to be narrowed. Accurate reformulation of the postulate Q1 does not
entail any paradoxes with measurement. This paper is agnostic concerning
particular interpretations of quantum mechanics. Nor does it refer to the
"collapse of the wavefunction."
