First, it is NOT "S*V", it is " " as you give in the problem itself. I don't know of any meaning for "S*V" for sets but is the "Cartesian product", the set of ordered pairs, (a, b), such that the first member, a, is from S and the the second member, b, is from V.

([a, b] and [c, d]aresets. They are the sets, in the number line, and . and is the set in the plane .)

And you will need information about the "product topology" to answer this question! A set of points, {(x,y)}, in is open if and only if the set of all "x" in the pairs is open in A and the set of "y" in the pairs is open in B.