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~~### from 10000 feet~~
~~Digital is a two-valued set.~~
Discrete sets, as ℕ ℤ and ℚ, are in [bijection][0] within themselves, and the number of elements in them is [Aleph (א) sub zero][1].
Continuum sets as ℝ or 𝕀 [are not in bijection to the former ℕ ℤ ℚ][3], and the number of elements in them is [Aleph (א) sub one][2].
[0]: https://en.wikipedia.org/wiki/Bijection
[1]: https://en.wikipedia.org/wiki/Aleph_number#Aleph-naught
[2]: https://en.wikipedia.org/wiki/Aleph_number#Aleph-one
[3]: https://en.wikipedia.org/wiki/Cantor%27s_diagonal_argument

Discrete sets, as ℕ ℤ and ℚ, are in [bijection][0] within themselves, and the number of elements in them is [Aleph (א) sub zero][1].
Continuum sets as ℝ or 𝕀 [are not in bijection to the former ℕ ℤ ℚ][3], and the number of elements in them is [Aleph (א) sub one][2].
[0]: https://en.wikipedia.org/wiki/Bijection
[1]: https://en.wikipedia.org/wiki/Aleph_number#Aleph-naught
[2]: https://en.wikipedia.org/wiki/Aleph_number#Aleph-one
[3]: https://en.wikipedia.org/wiki/Cantor%27s_diagonal_argument