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Homework Statement
In the textbook I'm reading it tells me that [itex]A \cup \bigcap B = \bigcap \left\{ A \cup X | X \in B \right\}[/itex] for B not equal to ø
Homework Equations
The Attempt at a Solution
I don't understand how this would work, the left side of the equation creates a set where all of the elements of [itex]A[/itex] are included but the right side of the equation takes the arbitrary intersection of [itex]A \cup X[/itex], so wouldn't this mean that some of the elements of [itex]A[/itex] aren't necessarily included in this newly constructed set as the elements of [itex]A[/itex] aren't by necessity also elements of [itex]X[/itex]?
How can the left side of the equation be equal to the right?