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Density is a feature of continua and analog.
The set of rational numbers is dense everywhere, which is to say that between any two different rational numbers a and b (where a is less than b), there is at least one rational number c that falls between them.
Consequently, there is an infinite number of other rational numbers between any given two (p16c).
Bronshtein, Muehlig, Musiol, and Semendyayev. Handbook of Mathematics. Berlin: Springer-Verlag, 2004.
what about the density of an irrational number?
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