It is kinda strange. There is no agreement on the definition of a relation.(adsbygoogle = window.adsbygoogle || []).push({});

Some books says it is a set of ordered pairs.

Other books says it is a subset of a cartesian product.

How nice if everything can be agreed down to a few axioms like Euclid's elements.

What is your favourite definition of a relation?

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# Definition of a relation

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