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WM: "Dark unit fractions have a smallest element."The function NUF(x) grows by 1 at every unit fraction. It starts from 0.
See?!
WM: "Visible unit fractions have the [or rather *a*] lower bound 0."It is the greatest lower bound because every greater number can be undercut by a visible unit fraction.
Right, but the dark unit fractions ARE BETWEEN 0 and all the visible unit fractions.So it is.
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