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Let X and Y be topological spaces and let f : X → Y be a function. Prove that the following statements are equivalent: (a) f: XY is continuous. (b) For any E CY, f-¹(Int(E)) ≤ Int(f-¹(E)). (c) For any ECY, ƒ˜¹(E) ≤ f¯¹(E).

Let X and Y be topological spaces and let f : X → Y be a function. Prove that the following statements are equivalent: (a) f: XY is continuous. (b) For any E CY, f-¹(Int(E)) ≤ Int(f-¹(E)). (c) For any ECY, ƒ˜¹(E) ≤ f¯¹(E).

Advanced Engineering Mathematics
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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Let X and Y be topological spaces and let ƒ : X → Y be a function. Prove that the following statements are equivalent: (a) f: X→Y is continuous. (b) For any EC Y, ƒ−¹(Int(E)) ≤ Int(f-¹(E)). (c) For any ECY, ƒ−¹(E) ≤ ƒ˜¹(Ē).
Transcribed Image Text:Let X and Y be topological spaces and let ƒ : X → Y be a function. Prove that the following statements are equivalent: (a) f: X→Y is continuous. (b) For any EC Y, ƒ−¹(Int(E)) ≤ Int(f-¹(E)). (c) For any ECY, ƒ−¹(E) ≤ ƒ˜¹(Ē).
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