Description of Parameters

Hint: There is a difference between parameters a and b and the parameter group c, d and e. The logical connective AND with a variable number of parameters needs a rule for unused parameters. Since an AND operation needs at least two parameters, a and b need to have a Boolean value, so they are not optional. If a or b have no assigned values (no value), they will be assigned the value false. For the optional parameters c to e, an unassigned value is interpreted as the parameter not being used. Unused parameters have to be interpreted as true for the AND operation to return the logically correct result, meaning parameters c to e will be interpreted as true if they have no assigned value.

Solution: Make sure that all parameters that should be used have a valid Boolean value (true or false), since no value is interpreted as the parameter not being used and will, therefore, for parameters c to e lead to an internal assignment of the value true to an unused parameter (and false for parameters a and b).

Examples