## Welcome to Serendeputy!

Serendeputy is your personal news assistant.

- learns what you like and don't like,
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How it works.

What to do:
I know the most common proof of $\lim_{x\rightarrow c}x^2=c^2$. But I wonder if my alternative proof is valid and correct. Here's my proof. Let $\varepsilon>0$, want to find a $\delta>0$ such that \$\forall x\in\mathbb{R},0<|x-c|<\delta\Rightarrow...