Sadly, Cantor's attic is making an error. This is all I know about Jager's ordinal collapsing functions.
I know it is in the paper, but it is not free. I want to know about the ordinal notation from Jager's ordinal collapsing functions.
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1$\begingroup$ isn't this the paper? (seems open access): publikationen.badw.de/de/001077193.pdf $\endgroup$– Carlo BeenakkerCommented Dec 18, 2019 at 15:45
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$\begingroup$ @CarloBeenakker "the paper" is actually link.springer.com/article/10.1007/BF02007140 . I fix the question text. $\endgroup$– HexirpCommented Dec 20, 2019 at 10:47
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I thank Carlo Beenakker for the comment.
I can see Jäger's function in Googology Wiki, now. This page is the revival of Cantor's Attic.