সেটের সূত্র

❖ AUB = A

❖ AUØ = A

❖ AUØ = Ø

❖ A∩A = A

❖ A∩U = A

❖ AU(B∩C) = (AUB)∩(AUC)

❖ A∩(BUC) = (A∩B)U(A∩C)