# Set Theory : Proof

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(A union B)* = (A*B*)* = (A* union B*)*

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##### Solution Summary

A set relation is proven. Set theory proofs are analyzed.

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First, A belongs to A*, B belongs to B*, so (A union B) belongs to (A* union B*). Thue (A union B)* belongs to (A* union B*)*.

Conversely, A belongs to (A union B) implies A* belongs to (A union B)*. Similarly, B* belongs to ...

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