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A relation R between two sets A and B is formally defined as a subset of the Cartesian product $A \times B$. This means that R is a collection of ordered pairs, where the first element of each pair belongs to set A and the second element belongs to set B.

Conditions: A and B are sets.; R is a binary relation between A and B.

A relation R between two sets A and B is formally defined as a subset of the Cartesian product $A \times B$. This means that R is a collection of ordered pairs, where the first element of each pair belongs to set A and the second element belongs to set B.

Conditions: A and B are sets.; R is a binary relation between A and B.