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\(\lim _{n\rightarrow \infty }\left ( 1-\frac {z}{n}\right ) ^{n}=e^{-z}\)
\(\lim _{h\rightarrow 0}\left ( 1-\lambda h+o\left ( h\right ) \right ) ^{\frac {t}{h}}=e^{-\lambda t}\)
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