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The contents of the Subclass reachability page were merged into Concept class on 18 December 2021 and it now redirects there. For the contribution history and old versions of the merged article please see its history.
This article should be merged to Computational learning theory. I would do it, but I think it needs someone with more knowledge of the topic. --Bduke (talk) 06:18, 18 November 2021 (UTC)Reply
I just merged it to Concept class based on the AfD debate at Wikipedia:Articles for deletion/Subclass reachability; you can be bold and revert all of it if you think that that's a poor choice. AFAICT the topic of this article was more about a particular aspect of concept classes than about computational learning theory in general, so that's why it got merged there. Duckmather (talk) 17:12, 18 December 2021 (UTC)Reply