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Tool: Predator Prey
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Description: This applet demonstrates a predator-prey growth model for the number of Foxes and Rabbits in a region given user input for the initial populations F_0 and R_0 and the Growth Rate for the Rabbit population. The difference equations used are: R_(i+1) = R_i + G*(1 - R_i / 500)*R_i - .0001*R_i * F_i and F_(i+1) = F_i + .0001*R_i * F_i - .02 * F_i.
Technology Type: Java Applet 
Author: Dave Zachmann
Language: English 
Cost: Does not require payment for use

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Tool: Population Dynamics in Central Park
Courses: Discrete Math Applications, Recurrence relations

Comment:Well made tool, it graphs "slowly" as the change is minor from one day to the next as it gets farther from the initial, but that's expected. Also, don't alt-tab waiting for it, it'll clear the graph.