Philosophy of Science
Given that quantum mechanics is validly applicable wherever classical mechanics is applicable, how are they related to one another? A consideration of this question leads to a reflection on the Correspondence Principle. We conclude that the most basic formulation of the Correspondence Principle refers to the continuity of formulae when applied to marginal matter, taking into account the differences in correspondence rules between a typical classical theory and QM.
Heelan, Patrick A., "Classical Mechanics and Quantum Mechanics" (1965). Research Resources. 22.