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Over at rack, I noticed brief mention of the notion of shelf. As some of you will know, shelves also crop up in large cardinal axioms, so I gave shelf its own subsection and mentioned some of the lore (e.g., Laver tables). The topic might be worth a separate page.
Definitely worth its own page!
is it on purpose, that you swapped $\triangleright$ and $\triangleleft$ from the wikipedia definition? And if so, why?
Dear Guest, please do some basic checking before accusing $n$labbers for laisy copying from wikipedia. The wikipedia article has been started in 2011, see https://en.wikipedia.org/w/index.php?title=Racks_and_quandles&action=history. The plethora of relations you refer to about the triangle left and right actions are in $n$Lab from 2010, see version 3 https://ncatlab.org/nlab/revision/rack/3. A left action in mathematics is more standardly denoted by triangle pointed to the left, which is LaTeX command triangleright, $\triangleright$. The conventions in the current wikipedia article are nonstandard.
You are welcome !
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