F-Law collision and system state recognition.*

Using function one direction S-rough sets (function one direction singular rough sets), f-law and F-law and the concept of law distance and the concept of system law collided by F law are given. Using these concepts, state characteristic presented by system law collided by F law and recognition of these states characteristic and recognition criterion and applications are given. Function one direction S-rough sets is one of basic forms of function S-rough sets (function singular rough sets).Function one direction S-rough sets is importance theory and is a method in studying system law collision.