Library ▹ Essentials ▹ Numbers ▹ Cardinal numbers
Proposition 1.8.2.15.  Let S be a set. Then:
|P(S)| = |Prp(S)| = 2|S|
No proof.
References.
  • https://en.wikipedia.org/wiki/Cardinal_number#Cardinal_exponentiation
  • https://mathworld.wolfram.com/CardinalExponentiation.html
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