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September  2009, 25(3): 1033-1039. doi: 10.3934/dcds.2009.25.1033

## Index sums of isolated singular points of positive vector fields

 1 Department of Mathematics, Huazhong University of Science and Technology, Wuhan, 430074, China

Received  May 2008 Revised  April 2009 Published  August 2009

In this paper we establish a theory on index sum of isolated singular points of positive vector fields and present a formula of index sum of isolated singular points of a positive vector field in the positive othant of $R^n$.
Citation: Xiao-Song Yang. Index sums of isolated singular points of positive vector fields. Discrete & Continuous Dynamical Systems - A, 2009, 25 (3) : 1033-1039. doi: 10.3934/dcds.2009.25.1033
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