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A duoidal category is a category equipped with a lax-commuting pair of monoidal structures. This feels like the kind if thing that should be expressable as an algebra over a "2-operad." Furthermore, it feels like this 2-operad should be expressable as a "lax BV-tensor product" of the associative operad with itself.
Is there a legitimate story here? My super general hope would be for a theory of n-operad for all n where there are inclusions that admit both left and right adjoints, under which the 2-operad parametrizing duoidal structures gets taken to either the operad or the operad . Furthermore, this theory should somehow extend the Gray tensor product.
Reuben, have you been in touch with Zbigniew Fiedorowicz about this question?
I haven't -- have they done work on this?
The topic smells related to their iterated monoidal categories, and so I thought possibly they've thought about this sort of thing.