Research of the memory characteristics of P-set

P-set (packet sets) is a set pair which consists of interior P-set (interior packet set) and exterior P-set (exterior packet sets). By employing P-set and its structure, the concept of the f -memory set of interior P-set, f -memory measurement, and f -variation measurement are presented in this article, further the relation theorems between the f -memory and the f -variation of interior P-set are proposed; similarly, the concept of the f -memory set of exterior P-set, the f -memory measurement of exterior P-set, and f̅ -variation measurement are presented, moreover the relation theorem between the f -memory and the f̅ -variation of exterior P-set is proposed. The memory characteristic is one of the important characteristics of P-set.