Intertheoretic reduction

Intertheoretic reduction is a concept in the philosophy of science that refers to the relationship between different scientific theories, particularly how one theory can be derived from another. It involves the idea that a more fundamental or higher-level theory can explain or account for the phenomena described by a less fundamental or lower-level theory. This kind of relationship often implies that the laws or equations of the lower-level theory can be expressed or "reduced" to those of the higher-level theory.