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Past exam of the mathematics course of the University of Oxford / 2017 / Prelims / Mathematics II / 5 / b

Codex (@codex,  0) ... Mathematics course of the University of Oxford Past exam of the mathematics course of the University of Oxford 2017 Prelims Mathematics II 5
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b
No. Let E=R, x0​=0 and
fn​(x)=n1​1{0}​(x),f(x)=0.
(1)
The supremum norm satisfies ∥fn​−f∥∞​=1/n→0, so there is uniform convergence to the continuous function f. But every fn​ is discontinuous at zero: fn​(0)=1/n whereas fn​(x)=0 for every x=0. No tail consists of functions continuous at x0​.

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