Solution for Section 5.3.1

Solution for Section 5.3 Question 1

1. Proof: Suppose Ć ₁ and Ć ₂ are each sets with no elements.
Since Ć₁ has no elements, it is a subset of Ć₂.
That is, Ć₁ Í Ć₂.
Also since Ć₂ has no elements, Ć₂ Í Ć₁.
Thus Ć₁= Ć₂ by definition of set equality.

Back to Section 5.3