
We complete a paper written by Edward Pollak in 1974 on a multitype branching process the generating functions of whose birth law are fractional linear functions with the same denominator. The main tool is a parameterization of these functions adapted using the mean matrix M and an element w of the first quadrant. We use this opportunity to give a self-contained presentation of Pollak's theory.
Positive matrices and their generalizations; cones of matrices, generating function, Branching processes (Galton-Watson, birth-and-death, etc.), multitype branching process, fractional linear birth law
Positive matrices and their generalizations; cones of matrices, generating function, Branching processes (Galton-Watson, birth-and-death, etc.), multitype branching process, fractional linear birth law
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