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We consider the model of Deijfen et al. for competing growth of two infection types in R^d, based on the Richardson model on Z^d. Stochastic ball-shaped infection outbursts transmit the infection type of the center to all points of the ball that are not yet infected. Relevant parameters of the model are the initial infection configuration, the (type-dependent) growth rates and the radius distribution of the infection outbursts. The main question is that of coexistence: Which values of the parameters allow the unbounded growth of both types with positive probability? Deijfen et al. conjectured that the initial configuration basically is irrelevant for this question, and gave a proof for this under strong assumptions on the radius distribution, which e.g. do not include the case of a deterministic radius. Here we give a proof that doesnt rely on these assumptions. One of the tools to be used is a slight generalization of the model with immune regions and delayed initial infection configurations.
The two-type Richardson model describes the growth of two competing infections on $mathbb{Z}^d$ and the main question is whether both infection types can simultaneously grow to occupy infinite parts of $mathbb{Z}^d$. For bounded initial configuration
The two-type Richardson model describes the growth of two competing infection types on the two or higher dimensional integer lattice. For types that spread with the same intensity, it is known that there is a positive probability for infinite coexist
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