Surcharge
Let an ordered set and F be a subset of E. An element x of E is: • an upper bound of F if it is greater than or equal to all the elements of F; ▪ a minority of F if it is less than or equal to all the elements of F:. ▪ If F has a majorant x then F is an augmented subset. ▪ If F has a minority x then F is a minority.