Groups and Lattices

Part I

(a) Determine whether

the set {1,2,3,4,5} is a group under the operation multiplication mod 6;

(b) determine whether

the set {1,2,3,4,5,6} is a group under the operation multiplication mod 7.

Part II

Answer the questions ath the end of this part's lecture.

Part III

Exercises 1 and 2 at the end of Chapter 11, Partee, Wall, ter Meulen.