1. Prove the Heine-Borel Theorem (Theorem 3.35).
2. Suppose f: X → Y maps from the metric space X to the metric
space Y, and x ∈ X.
Prove that f is continuous at x if and only if, for any sequence
{xn} in X that converges to x, f(xn) → f(x).
The goal of this exercise is to prove the following theorem in
several steps.
Theorem: Let ? and ? be natural numbers. Then, there exist
unique
integers ? and ? such that ? = ?? + ? and 0 ≤ ? < ?.
Recall: that ? is called the quotient and ? the remainder of the
division
of ? by ?.
(a) Let ?, ? ∈ Z with 0 ≤ ? < ?. Prove that ? divides ? if and...