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So it was first discovered in the year 1966! This is so cool!
@Nathanael Arkor It mentions that you re-typeset this. Thank you.
And thanks to @Valeria de Paiva as well since she is also mentioned in acknowledgements.
Ignat Insarov has marked this topic as resolved.
Mike Shulman said:
Would you be happy to cite an nLab page like [[endo-adjunction of Set]]?
If someone happens to create such a page, it would be convenient for a quick reference. It could link to endo-adjunctions in other categories, were such to be discovered.
It is very great and non-trivial that the Category Theory community is keeping the history accessible like this.