If $f_n,f$ are Riemann integrable functions on $[a,b]$, if $\lim_{n \to \infty} \int_{a}^{b}|f_n(x)-f(x)|dx = 0$, then is it true that $f_n \to f$ pointwise on $[a,b]$?
2026-02-23 23:09:20.1771888160
$\lim_{n \to \infty} \int_{a}^{b}|f_n(x)-f(x)|dx = 0$ implies $f_n \to f$ on $[a,b]$
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No. Let $f_{n}(0)=1$ and $f_{n}(x)=0$ for $x\in(0,1]$ and $f=0$.