Question: Let (a1, b1) and (a2, b2) be open intervals (a1 < b1 and a2 < b2). Show that the Cartesian product (a1,b1) (a2, b2) is

Let (a1, b1) and (a2, b2) be open intervals (a1 < b1 and a2 < b2). Show that the Cartesian product (a1,b1) (a2, b2) is an open region.

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