(a) Consider a function f: R → R whose graph Gf is a closed subset of R?. Use the sequential definition of continuity to prove that if f is also bounded then it is continuous. (b) Give an example of an unbounded function g: R → R which is discontinuous and yet its graph, Gg, is a closed subset of R?. (You should explain why G, is a closed subset of R2.)
(a) Consider a function f: R → R whose graph Gf is a closed subset of R?. Use the sequential definition of continuity to prove that if f is also bounded then it is continuous. (b) Give an example of an unbounded function g: R → R which is discontinuous and yet its graph, Gg, is a closed subset of R?. (You should explain why G, is a closed subset of R2.)
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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