Аннотация
In this paper we present novel results for discrete-time and Markovian continuous-time
multitype branching processes. As a population develops, we are interested in the waiting
time until a particular type of interest (such as an escape mutant) appears, and in how the
distribution of individuals depends on whether this type has yet appeared. Specifically,
both forward and backward equations for the distribution of type-specific population sizes
over time, conditioned on the nonappearance of one or more particular types, are derived.
In tandem, equations for the probability that one or more particular types have not yet
appeared are also derived. Brief examples illustrate numerical methods and potential
applications of these results in evolutionary biology and epidemiology.
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