Example 10.  Plot the solutions to the D. E.  [Graphics:Images/HarvestingModelMod_gr_184.gif]  in Example 9
that have the following initial conditions  x[0] = 4, 5, 6, 7, 8.

Solution 10.

We shall use the technique where we solve  [Graphics:../Images/HarvestingModelMod_gr_185.gif]  for  [Graphics:../Images/HarvestingModelMod_gr_186.gif].
You will get some warning messages from Mathematica, ignore them.  Hang in there !

[Graphics:../Images/HarvestingModelMod_gr_187.gif]

[Graphics:../Images/HarvestingModelMod_gr_188.gif]

Replace the values  [Graphics:../Images/HarvestingModelMod_gr_189.gif]  for the constant c[1],
and form the functions we wish to plot.

[Graphics:../Images/HarvestingModelMod_gr_190.gif]

[Graphics:../Images/HarvestingModelMod_gr_191.gif]

Make them look nicer.  

[Graphics:../Images/HarvestingModelMod_gr_192.gif]

[Graphics:../Images/HarvestingModelMod_gr_193.gif]

Graph these solutions.

[Graphics:../Images/HarvestingModelMod_gr_194.gif]


[Graphics:../Images/HarvestingModelMod_gr_195.gif]

[Graphics:../Images/HarvestingModelMod_gr_196.gif]

 

Observe.  The family of functions [Graphics:../Images/HarvestingModelMod_gr_197.gif]
tend to the constant function  [Graphics:../Images/HarvestingModelMod_gr_198.gif]  as  [Graphics:../Images/HarvestingModelMod_gr_199.gif].  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(c) John H. Mathews 2004