paul rubin <phr-pythonb...@nightsong.com> added the comment:

Totally tangential: Veky, your ordinal example would work ok in Haskell and 
you'd have omega work the same way as epsilon0.  Take a look at Herman Ruge 
Jervell's book "Proof Theory" for a really nice tree-based ordinal notation 
that goes much higher than epsilon0.  It would be cool if your student 
implemented it.  Raymond, I agree that ordinals are a very esoteric use of 
multisets ;).

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<https://bugs.python.org/issue40411>
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