Discrete math problems - theorem
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In basic algebra the following Theorem is used frequently.
If x,y and z are any three real numbers and if x + z = y + z then x = y.
The analogous statement for sets would read:
Let A, B, and C be any three sets.
If A union B = A union C then B = C.
Prove in detail that this statement is false. (Hint: Give a counterexample)
Then,
Write the converse of the above statement and show through an example that it is true.
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