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Proof for Images of Sets

College level proof before Real Analysis. Please kindly explain each step of your solution.

11. Let f: A --> B, and let {D_alpha: alpha is an element of Delta} an {E_Beta: Beta is an element of pi} be families of subsets of A and B, respectively. Prove that
(see attached)


Solution Summary

This solution provides step by step proofs regarding sets in an attached Word document.