The Born rule and its interpretation

The Born rule provides a link between the mathematical formalism of quantum theory and experiment, and as such is almost single-handedly responsible for practically all predictions of quantum physics. In the history of science, on a par with the Heisenberg uncertainty relations (→ indeterminacy relations) the Born rule is often seen as a turning point where indeterminism entered fundamental physics. For these two reasons, its importance for the practice and philosophy of science cannot be overestimated.