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Typo: Inequality as equality

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Typo: Inequality as equality

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"An easy way to see that $P_1$ effects a one-to-one correspondence between $\mathbb{Z}_+^2$ and $\mathbb{Z}_+$ is as follows: Define the ``successor'' of a pair $(x,y) \in \mathbb{Z}_+^2$ to be the pair $(x-1,y+1)$ when $x=0$ ; otherwise, when $x=0$ , the successor is $(y+1,0)$ ."

The first occurence of $x = 0$ should be replaced with $x \neq 0$ for the recursion to be well-defined.

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Status: Accepted
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