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Homework answers / question archive / 1) Use two different methods to describe the set of positive even integers that are less than 20
1) Use two different methods to describe the set of positive even integers that are less than 20.
2. Suppose that A, B, and C are sets such that A ⊆ B and B ⊆ C , please use Venn diagram to show that A ⊆ C.
3. Please prove the theorem: for every set S, we have ∅ ⊆ S and S ⊆ S.
4. Use mathematical induction to show that 1 + 2 + 2^2+ 2^3 + ? + 2^n = 2^n+1 − 1 For all nonnegative integers n
