Is R the set of real numbers. Consider the cartesian product R x R = R2

I don't understand this so much...Is all possible values of the set multiply by all possible values of the same set? Thanks!

Question

Is R the set of real numbers. Consider the cartesian product R x R = R2

I don't understand this so much...Is all possible values of the set multiply by all possible values of the same set? Thanks!

e.mccormick · Answer

They are not multiplying. It is the Cartesian product. Little different: http://en.wikipedia.org/wiki/Cartesian_product

jpsmarinho · Answer

Thanks!
so this cartesian product is only valid to sets?

e.mccormick · Answer

Well, a set can contain one number... so it can be used to do regular multiplication.  So it is more a way of extending multiplication onto sets of any size.

jpsmarinho · Answer

Thank you so much for the explanation!

e.mccormick · Answer

np.  have fun!