Once upon a time, there was a magical kingdom where everything was made up of pairs. The king of this kingdom was very curious about the cardinality, or the number of elements in each class. He wanted to know how many pairs there were in total.

One day, he asked his wise advisor to help him. The advisor told him about the concept of a complement, which is a set that contains all the elements that are not in another set. The king was fascinated and asked the advisor to show him an example.

The advisor took out two sets of pairs, one with red elements and one with blue elements. He then explained that the complement of the red set was the blue set, and vice versa. The king was amazed and asked how they could find the number of elements in each set.

The advisor then introduced the concept of partitions, where a set is divided into smaller subsets. He showed the king how to divide the sets into smaller partitions, making it easier to count the number of elements.

The king was so pleased with what he had learned that he declared that every member of the kingdom would learn about cardinality, class, complement, element, limit, member, pair, and partition. And so, from that day on, every child in the kingdom learned about these important mathematical concepts.

The end.

Reflections

1. What was the king curious about?
2. What is a complement in the story?
3. How did the advisor divide the sets into smaller parts?
4. What did the king declare for every child in the kingdom to learn?
5. What is a partition in the story?