    Sentence t Under Boolean aigebra , Whos theo  set thot is closed under the two commutative  binary operations and that can be described by  ony of various system@§of postulstes all of  which can be deduced from the postulates thot  an identity element exists for each operation,  thot each operation is distributive over the  ‘othe, and that for every element in the set  there is another element which when combined  with the first under one of the operations yields  the identity element of the other  operationcunder the operations of taking  intersections and unions, the subsets of a given  set forma Boolean algebra    Sentence 2: Boolean algebra is formed from the  subsets of a given set, and under Boolean  algebra certain sets are closed underneath two