Bifalgorithm post · Brisk · Chapter 1

Is {(Chuck, basketball), (basketball, volleyball)} a relation between A and S?

Is {(Chuck, basketball), (basketball, volleyball)} a relation between A and S? (Brisk · Chapter 1) — "No, since the first element of one of the ordered pairs i…

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The answer is no.
An ordered pair must have its first element in set A.
One of the ordered pairs has a first element that is not in set A.

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Is {(Chuck, basketball), (basketball, volleyball)} a relation between A and S?

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"No, since the first element of one of the ordered pairs is not from the set A."

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