Abstract

The inherent necessity of wave functions may be determined in either of two ways. One way, frequently presupposed, states that the fundamental validity of wave functions is determined generically: The nature of the system determines the assignability of inherently necessary wave functions. The other approach holds that it is the specific experiment which determines the systems for which description by use of wave functions is fundamentally valid. A guideline based on this contextual approach is proposed and tested in three experimental situations