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- Nov 12th 2013, 08:32 AM #16

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## Re: map (m,n) to N

Surjective is academic.

All that is required for countabilty of g(m,n), m,n countable, is for g(m,n) to be a mapping, any mapping, even countably multi-valued, for ex, g(m,n) = +/-sqrt(mn), mn positive and countable.

Hmmm. Got through after multiple tries. Thanks

- Nov 12th 2013, 09:12 AM #17

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## Re: map (m,n) to N