Is it in an old edition? I just downloaded an extremely legitimate version of Algorithms 4th edition but it has no section on union data structure.
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It should be in Chapter 1 Section 5 of the 4th edition. It's even in the table of contents.
Sorry, my bad. I searched for the word "disjoint" expecting it to be prominent in this section but somehow this word only appears 3 times in this book non of which are in this section!
Anyway, while the figures in this work were indeed gorgeous, it was not what I was looking for. It did not even contain a non-intuitive analysis of the inverse ackermann complexity, much less an intuitive one!