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\begin{align} a &= \sqrt[x]{b}\\ b &= a^{x}\\ x &= \log_{a}b \\ \end{align}
$$ e = \lim_{n\rightarrow \infty }\left ( 1+\frac{1}{n} \right )^{n}=2,71828\; 18284\; 59045\; 23536... $$
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