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Concerning his claim "But never two (different) unit fractions at the same coordinate.": it is so trivial that it's hard to state/express it properly.To put it in simple words: /different/ means /not the same/.
Unit fractions are real numbers. And "two" unit fractions (and hence real numbers) a, b are either identical (a = b) or not (a =/= b). That's all.
Well, my last shot: If a and b are two _different_ unit fractions, then there's no real number c such that a = c = b (though -of course- a and b are real numbers).
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