The concept of topological group is a simple combination of the concepts of abstract group and topological space. The purpose of this paper is to combine the concepts of topological space and rough groups; called topological rough groups on an approximation space. Allam, M. Bakeir, E.
Jeff Beck Group - Rough And Ready | Releases | Discogs
The theory of rough sets is an extension of the set theory, for the study of intelligent systems characterized by insufficient and incomplete information. Since proposed by Pawlak, rough sets have evoked a lot of research. Theoretic study has included algebra aspect of rough sets. In paper  the concept of rough group and rough subgroup was introduced, but with some deficiencies remaining.
As a songwriter, Beck contributed more pieces to Rough and Ready than he had before, or ever would again. Beck enlisted Bobby Tench as vocalist and it is also the first time keyboardist Max Middleton is heard. Other members of this line up are drummer Cozy Powell and bassist Clive Chaman. Later in April that year the new band began recording sessions at Island Studios , London.