How might the idea of the correspondence principle be applied outside the field of physics?

Solution 43E According to the principle of correspondence, the behaviour of a system described by quantum mechanics will reduce to the classical limit if the system is very large or the quantum number is very large. For example, if we consider the behaviour of a quantum harmonic oscillator. The energy states are discrete if we consider the small quantum number, and the states come closer to each other if we increase the quantum number. For very large quantum number (n ), the energy states will be continuous. Let...