mbcsantin
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Prove or find counterexamples:
If A x B = empty set then A = empty set or B = empty set.
If A x B = empty set then A = empty set or B = empty set.
Using the definition of the binary product
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Well, you titled this "using the definition of the binary product"?
So what is the definition of A x B?
Then consider using an indirect proof: If neither A nor B is empty...
So what is the definition of A x B?
Then consider using an indirect proof: If neither A nor B is empty...
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