Example 17.  Plot the solutions to the D. E.  [Graphics:Images/HarvestingModelMod_gr_292.gif]  in Example 17
that have the following initial conditions  x[0] = 1, 2, 3, 4, 5, 6.

Solution 17.

We shall use the technique where we solve  [Graphics:../Images/HarvestingModelMod_gr_293.gif]  for  [Graphics:../Images/HarvestingModelMod_gr_294.gif].
You will get some warning messages from Mathematica, ignore them.  Hang in there !

[Graphics:../Images/HarvestingModelMod_gr_295.gif]

[Graphics:../Images/HarvestingModelMod_gr_296.gif]

[Graphics:../Images/HarvestingModelMod_gr_297.gif]

[Graphics:../Images/HarvestingModelMod_gr_298.gif]

Replace the values  [Graphics:../Images/HarvestingModelMod_gr_299.gif]  for the constant c[1],
and form the functions we wish to plot.

[Graphics:../Images/HarvestingModelMod_gr_300.gif]

[Graphics:../Images/HarvestingModelMod_gr_301.gif]

Graph these solutions.

[Graphics:../Images/HarvestingModelMod_gr_302.gif]


[Graphics:../Images/HarvestingModelMod_gr_303.gif]

[Graphics:../Images/HarvestingModelMod_gr_304.gif]

 

Observe.  The each population curve becomes extinct.  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(c) John H. Mathews 2004