Part of the Undergraduate Texts in Mathematics book series (UTM)
These days school children are taught about sets. A second grader* was asked to name “the set of girls in his class.” This can be done by a complete list such as:
A problem arises when there are duplicates. To distinguish between two Barbaras one must indicate their family names or call them B 1 and B 2. The same member cannot be counted twice in a set.
“Nancy, Florence, Sally, Judy, Ann, Barbara,...”
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© Springer Science+Business Media New York 1974