f(x)=1,xeQ(adsbygoogle = window.adsbygoogle || []).push({});

f(x)=0,x in not eQ

It's easy to understand that this function has no limit as x tends to 0,but how we can prove it with mathematical formulas.

And what's the lim[e^n-(1+1/n)^n^2]

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# No limit

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