Results 16 to 17 of 17

- Nov 12th 2013, 09:32 AM #16

- Joined
- Aug 2010
- Posts
- 961
- Thanks
- 98

## 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, 10:12 AM #17

- Joined
- Nov 2010
- Posts
- 1,974
- Thanks
- 799

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