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@@ -143,3 +143,7 @@ The Poisson distribution can be used to approximate binomial distribution.
Two independent Poisson r.v. added together give a poisson distribution with $\lambda = \lambda_1 + \lambda_2$.
\end{lemma}
+
+\begin{lemma}
+ The interarrival between events are a exponential random variable with rate $\lambda$.
+\end{lemma}