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- Thread starter Amer
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- Thread starter
- #1

- Feb 29, 2012

- 342

- Thread starter
- #3

- Feb 29, 2012

- 342

Cheers.

- Jan 29, 2012

- 1,154

An example would be with X the set of students in your class, Y numbers. The set of ordered pairs would be a student and the student's weight. Two students might have the same weight but a single student would not have two different weights.

This is, of course, the same Fantini's definition with his rule telling how the pairs are formed, my pairs defining his rule.