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Nonnegative Integers

If the solution to this nonnegative integer question is correct, then you may respond that it is.

If the solution needs ANY kind of improvement, in presentation, in clarity, in correctness, if a proof can be more elegant, then please rewrite the entire solution.


Solution Preview

It's correct.

The most difficult part is to prove that there are distinct elements a, b, c, and d of Q such that the product ab and the product cd are equivalent to ...