Philosophy of the PDE Approach
Formal models on computer are a tool to support the human brain. In the same way that a pencil can help the scientist remember his present thoughts, a computer model can help the scientist consider simultaneously more variables and interdependencies than he could manage even with a well-trained mind. Because population-development-environment interactions are highly complex, a nonformal, noncomputerized analysis such as that presented in the chapters in Part II can only describe relevant aspects and interactions one after the other. This approach may be appropriate for understanding the history and describing the course of events that have already taken place and that will not be altered by the model of the scientist, although its interpretation may well be altered.
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