The alternative specification is sometimes more convenient than the one given above, and some authors will use it as a standard definition. This alternative specification is not used here. Unfortunately this gives rise to a
notational ambiguity. In general, the reader must check which of these two specifications is being used if an author writes "
X ~ Exponential(
λ)", since either the notation in the previous (using
λ) or the notation in this section (here, using
β to avoid confusion) could be intended.
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