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  1. The function returns 0 if FALSE and 1 if TRUE
  2. If the expressions are string values, the comparison yields results according to Visual Basic conventions for string comparison.
  3. IF() returns a Boolean value (0 or 1). CONSTRAINTs CONSTRAINTs have a general drawback that they need to be checked continuously during the model assembling process. If one is not fulfilled any more, the Modeller must adapt the template which is often rather time consuming. IF() offers an elegant solution if frequent adaptations of the system of equations are expected in multi-case calculations. By making one equation consisting of several parts (or ranges), we can set the invalid parts equal to zero by multiplying them by:

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