Answered: Exercise 2.35. Suppose X is a…

Exercise 2.35. Suppose X is a topological space, and for every pe X there exists a continuous function f: X → R such that f-1 (0) = {p}. Show that X is Hausdorff.

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Question

● Exercise 2.35
► Exercise 2.35. Suppose X is a topological space, and for every pe X there exists a
continuous function f: X → R such that f-¹(0) = {p}. Show that X is Hausdorff.

Expert Solution

Step 1

It is given that $X$ is a topological space. For every element $p \in X$ there exists a continuous function so that $f : X \to ℝ$ such that $f^{- 1} (0) = \{p\}$ . Prove that $X$ is Hausdorff.

Definition: Let $X$ be a topological space. The topological space $X$ is said to be Hausdorff, if given $p, q \in X$ and $p \neq q$ , there exists open sets $U$ and $V$ such that $p \in U$ and $q \in V$ and $U \cup V = \emptyset$ , that is, the sets are disjoint.

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