Problem 456 (difficulty: 2/10)

In which points is the following function continuous?

\(\displaystyle f(x)=\begin{cases} e^{-{1\over x^2}} & \text{if $x\neq0$} \\ 0 & \text{if $x=0$} \end{cases}\)

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Request for a concrete problem:I want problem no.

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