General Concepts

Abstract

If the normalization relation

$$\int {{d^3}} x\psi * \psi = 1$$

((1.1))

is interpreted in the sense of probability theory, so that ${d^3}x\psi * \psi$ is the probability of finding the particle under consideration in the volume element d³x, then there must be a conservation law. This is to be derived. How may it be interpreted classically?