Homework for Math 362A
Spring, 2008


Problem Set

Chapter

Problems

05 ∗10 Let E be a subset of a metric space X. Show that E is dense in X if and only if for each point a in X and each r > 0, the ball B(a, r) has nonempty intersection with E.
∗11 In my copy of Rudin's text, Theorem 2.38 says, “If {In} is a sequence of intervals from the real line such that InIn+1 (n = 1, 2, 3, ...), then ∩n In is nonempty.” Show that this statement is, in fact, false.
∗12 Prove the Nested Interval Theorem (M.17).

Notation

n manditory problem
∗n manditory problem, not from text
(n) helper problem
[n] ungraded problem
[∗n] ungraded problem, not from text
{n} optional problem