A is a subset of B if and only if all elements of A are already present in B
The set of all subsets of a set A is called the power set of A
The null set is a subset of all sets
- Every set is a subset of itself
If A=B, A $$\subset$$ B and B $$\subset$$ A
- A $$\cup$$ (B$$\cup$$C) = (A $$\cup$$ B)$$\cup$$C
- A $$\cap$$ (B$$\cap$$C) = (A $$\cap$$ B)$$\cap$$C
- A $$\cup$$ (B$$\cap$$C) = (A $$\cup$$ B)$$\cap$$( A $$\cup$$ C)
- A $$\cap$$ (B$$\cup$$C) = (A $$\cap$$ B)$$\cup$$( A $$\cap$$ C)
- A $$\cup$$ Ø = A
