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Part 7: Interval

Consider the case that the answer to a problem is an interval.
The syntax is similar to the one for sets

The solution is defined by a left boundary ([ for closed and ] for open), two semicolon separated numbers or variables, and a right boundary (] for closed or [ for open)
Here is an example

\begin{problem}

        \begin{question}
                \text{Write down the Interval from 1 to 3:}
                \explanation{Test test Test}
                \type{input.interval}
                \field{rational}

                \begin{answer}
                        \text{ A = }
                        \solution{[1;3]} % or ] for open type, the boundaries should be separated by ";" 
                \end{answer}
        \end{question}

\end{problem}

There is the optional TeX command \allowIntervalUnionsForInput[<boolean, default: true>] with which you can enable
the option that the student's answer can be given by the union of multiple intervals.

  \begin{answer}
    \text{input.interval: $[1;4) = $}
    \allowIntervalUnionsForInput
    \solution{[1;4)}
  \end{answer}    

Furthermore as an author you can give the correct solution as an union of multiple disjoint intervals by seperating them with a comma, an example:

\solution{(-infinity;2],[3;infinity)}

Be aware that this is only possible if the optional command \allowIntervalUnionsForInput is used.

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