0 votes 0 votes I am confused. I can't figured out how to find GLB, LUB. In what cases and How they don't exists. Please tell me how to do it. Thanks ! Set Theory & Algebra lattice + – Sei Karma asked Oct 9, 2016 Sei Karma 1.7k views answer comment Share Follow See 1 comment See all 1 1 comment reply mcjoshi commented Oct 9, 2016 reply Follow Share If you would have given some question i would have explained you in a much better way. Draw the Hasse diagram, take any two points in Hasse diagram now GLB (greatest lower bound) is the closest point in lower direction where these two points meet. and LUB is the the closest point in upward direction where they meet. Post the question where you are facing difficulty. 2 votes 2 votes Please log in or register to add a comment.