Appendix B

Poisson Events

I want to establish some of the properties of Poisson processes that were employed in Chapters 3 and 6 and were either left unproven there or explained by simple heuristics. Certain standard results, such as the mean and variance of a Poisson distribution, can be found in the books by Ross [99, 100], the ones chosen among the many other possible references in probability that could have been cited.

Note that throughout this appendix I assume a certain familiarity with the notion of conditioning one random variable on another, as explained, for example, in Chapters 6 and 7 of Ross [99] and in Appendix D.

To begin with, let’s return to two results stated but not proved in Section 3.2. First, Let *N _{i}*(

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