He has a previous video called "Formal Definition of a Function using the Cartesian Product". He wants to contrast his present video with that one, not a formal definition but an intuitive idea. A function is a well-defined thing.
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He has a previous video called "Formal Definition of a Function using the Cartesian Product". He wants to contrast his present video with that one, not a formal definition but an intuitive idea.
A function is a well-defined thing. By using the definite article, he is suggesting that there is no more than one way of conceiving of it intuitively, since it is such a narrow idea. He chose th