Mathematical Biosciences and Engineering, 2010, 7(1): 187-194. doi: 10.3934/mbe.2010.7.187.

Primary: 37L15, 39A11; Secondary: 92D25.

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An extension of the formula for spreading speeds

1. School of Mathematics, University of Minnesota, Minneapolis, Minnesota 55455
2. Department of Mathematics and Statistics, Memorial University of Newfoundland, St. John’s, NL A1C 5S7


A well-known formula for the spreading speed of a discrete-time recursion model is extended to a class of problems for which its validity was previously unknown. These include migration models with moderately fat tails or fat tails. Examples of such models are given.
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Keywords integrodifference equations; linear determinacy.; spreading speeds; discrete-time recursions

Citation: Hans F. Weinberger, Xiao-Qiang Zhao. An extension of the formula for spreading speeds. Mathematical Biosciences and Engineering, 2010, 7(1): 187-194. doi: 10.3934/mbe.2010.7.187


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