The EPR criterion states, "If, without in any way disturbing a system, we can predict with certainty (i.e., with probability equal to unity) the value of a physical quantity, then there exists an element of reality corresponding to that quantity."
Trích nguyên bản từ bài báo của EPR: " If, without disturbing a system, we can predict with certainty the value of a physical quantity," then " there exists an element of physical reality corresponding to this physical quantity."