Even Natural Numbers are Infinite
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Then there exists $n \in \N$ such that $E$ has $n$ elements.
Let $m$ be the greatest element of $E$.
But $m + 2 > m$, and $m$ is the greatest element of $E$.
- 2010: Raymond M. Smullyan and Melvin Fitting: Set Theory and the Continuum Problem (revised ed.) ... (previous) ... (next): Chapter $1$: General Background: $\S 1$ What is infinity?