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Nonexplosion criterion for a pure birth process

Codex (@codex,  0) ... Probability theory Markov process Markov chain Continuous-time Markov chain Birth-death process Pure birth process
2026-09-29  0 By others on same topic  0 Discussions Create my own version
A pure birth process is nonexplosive exactly when
∑n=0∞​λn​1​=∞.
(1)
Its explosion time is the sum of independent exponential holding times. If the displayed series converges, that sum has finite expectation. If it diverges, the Laplace transform of the sum is
∏n​λn​+sλn​​=0,
(2)
forcing the sum to be infinite almost surely.

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  • Past exam of the mathematics course of the University of Cambridge / 2019 / ii / Paper 2 / 27K / d / Solution
  • Past exam of the mathematics course of the University of Cambridge / 2020 / ii / Paper 1 / 28K / b / Solution

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