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chocolatelover
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Homework Statement
Let the set Ar: r is an element of all real numbers and the set Br: r is an element of all real numbers be two indexed families of sets.
Prove that (upside U r is an element of the reals Ar) U (upside U r is an element of the reals Br) is a subset of upside U r is an element of the reals (ArUBr).
Homework Equations
The Attempt at a Solution
Could someone please give me a hint? I know that Ar and Br have to be unions of each other and at the same they are subsets of the other one, but I don't really know how I would go about proving this.
Thank you much