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As @zkutch says, this refers to the cartesian product of two sets. Its definition has to do with sets, not with functions. The formal definition is as follows: For two sets $A,B$ we define $$A\times B:= \{(a,b)\mid a\in A, b\in B\}$$ Which is the set of all tuples from A and B. In the context of functions, it might be simpler to think of this as: a function ...

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