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The algebra $U^+_q$ and its alternating central extension $\mathcal U^+_q$. (arXiv:2106.14884v1 [math.QA]) http://arxiv.org/abs/2106.14884
The algebra $U^+_q$ and its alternating central extension $\mathcal U^+_q$. (arXiv:2106.14884v1 [math.QA]) http://arxiv.org/abs/2106.14884