reza95 wrote:Theorem (proof that)
a) A Delta B = AÚ B if A Subscription B= Null
b) A Subscription (B Ù C) = (A Subscription B) Ù (A Subscription C)
What does "Delta" indicate? What does "Ú" mean? What does "Subscription" mean in this context? Does "Null" mean "the empty set"?
What are your thoughts? What have you tried? How far did you get? Where are you stuck?
Please be complete. Thank you!