Exercise 1. 1) Suppose the topological space X is the union of the finite family F₁,..., Fm of closed subsets of X. If f: X→Y is a map from X to the topological space Y, show that f: X→Y is continuous if and only if each restriction f|F₁: F₁ →Y, i = 1,...,m, is continuous. 2) If we assume that X = UiENFi, with each F₁ a closed subset of the topological space X, and f: X → Y is a map such that every restriction fF; : F; → Y, i € N, is continuous, does it follow that f is automatically continuous? [If true prove it, if false give an example]

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Exercise 1 Need part 1 and part 2
Exercise 1. 1) Suppose the topological space X is the union of the finite family F₁,.
subsets of X.
Fm of closed
If f: X→Y is a map from X to the topological space Y, show that f: X→Y is continuous if
and only if each restriction f|F: F₁ →Y, i = 1, ..., m, is continuous.
2) If we assume that X = UieNFi, with each F; a closed subset of the topological space X, and
f: X→ Y is a map such that every restriction f F₁ : F; → Y, i ≤ N, is continuous, does it follow
that f is automatically continuous? [If true prove it, if false give an example]
Transcribed Image Text:Exercise 1. 1) Suppose the topological space X is the union of the finite family F₁,. subsets of X. Fm of closed If f: X→Y is a map from X to the topological space Y, show that f: X→Y is continuous if and only if each restriction f|F: F₁ →Y, i = 1, ..., m, is continuous. 2) If we assume that X = UieNFi, with each F; a closed subset of the topological space X, and f: X→ Y is a map such that every restriction f F₁ : F; → Y, i ≤ N, is continuous, does it follow that f is automatically continuous? [If true prove it, if false give an example]
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