version 1.2; 1.7.2003:
applets running, i.e. every Internet Browser with Java VM can show the
graphs. Just click example1.html / example2.html to try

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version 1.1; 30.6.2003:
now you can change the important values inside the graphical 
interface, i.e. you want have to recompile all the time to see how
the changed parameters influence the function behaviour

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version 1.0; 27.6.2003
This is my first graphics try in Java; after downloading and 
unpacking "modelPop.zip" please compile all .java files

Executing "chaosPop" you will see the graph of the size of two 
identical populations, where the function is not depending on 
anything except the corresponding species mean fertility and last 
steps pop. size - Anyway you will see that for an fertility of 4.0 
(set by default) the graphs go very different ways after only few 
steps despite of the fact that their initial population sizes are 
set to 0.98765000 and 0.98765001; thus they differ only by 0.00000001
This is chaotic behaviour. More on the topic can be found in:
Sigmund, Karl: Games of Life, Wien 1993

Executing "interPop" you will see the graphs of two interacting
populations, where predators population size is the green graph
and preys pop size is the red graph. The initial values show a stable 
interaction between the species (so no one dominates the other)
But changing those values just a little (some hints for good changes
are given in "interPop.java") can cause the populations cease to
exist. The equations I used are in the literature known as 
Lotka-Volterra model, the first mathematical model of interacting
species.