As we have said in chapter 1, modelling is an active pursuit which you learn best by doing yourself or in a small group. A variety of examples have been selected for ‘getting started’ and, while each has been developed in the text, it may be preferable to try some first directly from the problem descriptions given. On the other hand, you may be more at home after seeing how they are tackled, and in any case you may wish to check the results and ‘solutions’. We must be careful here about using terms such as ‘solution’, since in modelling there are many cases where there is no single solution in the conventional manner. Also the term ‘problem’ will be used as well as ‘model’ and you may wonder whether there is any difference. We shall return to this point in chapter 3; in the meantime, we shall set these semantics to one side.
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