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The Second Derivative and Population Modeling: Another View

George Innis
Ecology
Vol. 53, No. 4 (Jul., 1972), pp. 720-723
Published by: Wiley
DOI: 10.2307/1934789
Stable URL: http://www.jstor.org/stable/1934789
Page Count: 4
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The Second Derivative and Population Modeling: Another View
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Abstract

In a paper with a similar title (see Ecology: 606-613), John Clark argues for the use of second-order differential equations in population modeling. To refute his arguments, this paper (1) demonstrates the similarity of sets of higher order ordinary differential equations to sets of first-order ordinary differential equations, (2) discusses both practical and philosophical aspects of the inclusion of @'historical@' effects in a biological model, and (3) argues that intrinsically second-order biological or physical processes have not been observed.

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