How would you prove that if A, B, C, and D are sets, then (A ∩ B) X (C ∩ D) = (A X C) ∩ (B X D)?
How do I prove that if A, B and C are sets, then A × (B −C) = (A ×B) − (A ×C)?
כיצד תוכיח שאם A, B, C ו-D הם קבוצות, אז (A ∩ B) X (C ∩ D) = (A X C) ∩ (B X D)?
איך אני מוכיח שאם A, B ו-C הם קבוצות, אז A × (B −C) = (A ×B) − (A ×C)?