Page 20 - Chapt1

Bagaimana cara A common style of proof for

membuktikan statements about sets is to
choose an element in one of

hukum tersebut ? the sets and see what we

know about it.

Proof:

Proof: suppose x ∈ , then we have x ∉ A∩B, so

x ∈ or x ∈ , which means that x ∈ . Thus,

⊆

Conversely, suppose x ∈ , then we have x ∉ A or x ∉ B , so

x ∉ A ∩ B, which means that x ∈ .Thus

⊆
Therefore,