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Apr 28, 2019 at 20:14 comment added Nicola Ciccoli @Jim Humphreys, my work was in the same setting of De Concini - Kac-Procesi approach to qg's at roots of unity. I agree that the relation between various approaches is at times subtle and overlooked in a significant part of the published literature.
Apr 28, 2019 at 20:09 comment added Jim Humphreys @Nicola Ciccoli: It's not a matter if self-citation, but rather a question as to which version of "quantum group" is being asked about by Konstantinos. Unfortunately, the relationship between the versions has apparently not been made explicit anywhere. You might look at my answer to a much earlier question mathoverflow.net/questions/57027/…
Apr 26, 2019 at 17:23 history answered Nicola Ciccoli CC BY-SA 4.0