# American Institute of Mathematical Sciences

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

## An extension of the formula for spreading speeds

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

Received  April 2009 Revised  August 2009 Published  January 2010

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