Middle attic

From Cantor's Attic
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Welcome to the middle attic, where you will find many of the commonly used concepts of infinity in set theory.



  • The \(\beth_\alpha\) hierarchy
  • \(\beth_\omega\)
  • The \(\aleph_\alpha\) hierarchy
  • \(\aleph_\omega\)
  • \(\aleph_3\)
  • \(\aleph_2\)
  • \(\frak{c}\), same as \(\beth_1\)
  • \(\aleph_1\)
  • \(\aleph_0\), same as \(\beth_0\)