Roster or Tabular Form. A set of all the lowercase letters of the alphabet. Then an odd integer being one more than a multiple of 2 is x 2m 1.
X x 5.
A set of all the lowercase letters of the alphabet. Sometimes the set is written with a bar instead of a colon. Any value greater than 0. When talking about sets it is fairly standard to use Capital Letters to represent the set and lowercase letters to represent an element in that set.