Here is the problem. How would I go about proving this one? Thanks!!
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Consider the function $\displaystyle \displaystyle f: U \cup V \to \mathbb{N}$ by $\displaystyle f(z)=\begin{cases}2n-1 \text{ if } z=x_n \\ 2n \text{ if } z=y_n\end{cases}$
Would i do this with direct proof or contradiction?
The method TES offered gives you a direct proof.
Thanks!
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