What is the correspondence between the old and new physical theories?

According to the correspondence principle, the new theory does not completely deny the old theory. The new theory contains the possibility of establishing a continuity between the old and the new theories and, in a limited area of application, gives the same results as the old one.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.