Please explain the solution (Real Analysis)

1. Aug 29, 2010

phillyolly

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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2. Aug 29, 2010

Hurkyl

Staff Emeritus
What parts do you get? What parts are you having trouble with?

3. Aug 29, 2010

phillyolly

My understanding shuts down in the second paragraph, second sentence.

4. Aug 29, 2010

Do you understand why $$\textbf{N}^k$$ is countable?