Formulations explaining the behaviour of objects moving at relativistic speeds reduce to the classical Newtonian  relations for objects moving at low speeds.  
Formulations explaining the behaviour of objects moving at relativistic speeds reduce to the classical Newtonian  relations for objects moving at low speeds.  Likewise, a description of the structure of quantum sized objects should explain the behaviour of macroscopic objects as well.  The term for this belief was coined when, while trying to describe the orbits of electrons about a nucleus, Niels Bohr postulated that any new physical law should match up with classical laws under the appropriate circumstances. FTP identify this term.
Formulations explaining the behaviour of objects moving at relativistic speeds reduce to the classical Newtonian  relations for objects moving at low speeds.  
Correspondence principle