Abstract

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:

“Nancy, Florence, Sally, Judy, Ann, Barbara,...”

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.

Keywords

Prefix 

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Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • Kai Lai Chung
    • 1
  1. 1.Department of MathematicsStanford UniversityStanfordUSA

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