- #1
aaaa202
- 1,169
- 2
Homework Statement
Proove that Nx{0} is countable. x stand for a product i.e. like the cartesian product NxN
Homework Equations
N is countable.
The Attempt at a Solution
This is so obvious since Nx{0} is just (1,0),(2,0) etc. But how do you write a proof formally?