Howdy, I just stumbled on this forum and was hoping someone could help with this proof:(adsbygoogle = window.adsbygoogle || []).push({});

If a and b are elements of the Rational Number set, then a*b=0, if and only if a=0 or b=0

With that in mind, I need to prove that:

- Prove that if a=0 or b=0, then a*b=0
- Prove that if a*b=0, then a=0 or b=0

Any help is appreciated, cheers.

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# Need some help on a proof!

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