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Is there a reason we don’t care about these?
We could have something like: k-tuply posetal n-categories are the same as k-1-tuply posetal n+1 categories (with distinguished n+1-morphisms in each inhabited hom-set between n-morphisms) with parallel n+1-morphisms equivalent
I suppose it has something to do with the fact that this stabilizes for k>1!
So these are just n-posets I guess. The reason I asked the question is we do appear to have the right kind of adjoint pair between Posets (“1-tuply posetal 0-cats”) and Categories with a distinguished morphism in each inhabited hom set [distinguished morphisms closed under composition and include identities] (“0-tuply posetal 1 cats”) that restricts to the equivalence of posets and posets-viewed-as-categories.
Higher posets are more fundamental than higher categories. It's backwards to think of posetal categories as a modification of categories. Rather, an -category is a -tuply groupoidal -poset (and an -groupoid is an -tuply groupoidal -poset).
But the usual numbering scheme goes the other way: an -groupoid is an -category, an -category is an -category, and an -poset is an -category. It's sheer bigotry that we use ‘category’ as the base of this naming scheme (rather than the extreme concepts of groupoid and poset), and then use an unnatural numbering scheme (from to ) to match that.
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