Wave function. However, complex numbers are not necessarily used in all treatments.
Louis de Broglie in his later years proposed a real-valued wave function connected to the complex wave function by a proportionality constant and developed the de Broglie–Bohm theory. The unit of measurement for ψ depends on the system. For one particle in three dimensions, its units are [length]−3/2. Complex Argument. Euler's formula.svg - Wikipedia, the free encyclopedia.