3.1 What is Mathematical Modelling
  3.1.1 Some definitions
  3.1.2 Course view
    3.1.2.1 Comments
  3.1.3 Illustrative example
    3.1.3.1 Comments
    3.1.3.2 Possible solutions
    3.1.3.3 Comments
    3.1.3.4 Revied definition