This proof is so much more complicated than I thought it would be.
The doubly infinite chain reminds me of how we are taught that there is no beginning nor end to the Gods. Thus each God came from an earth ruled by a God who came from an earth... etc. There is no beginning. It is hard to understand the implications of that.
"[T]he restriction of an injective function is still injective" is such a nice trait.
How does example 32.3 serve as an example of the Schroder-Bernstein theorem? I don't really see how it makes use of the theorem.
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