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Un scindage du morphisme de Frobenius quantique

We show that the quantum Frobenius morphism constructed by Lusztig in the setting of the quantum enveloping algebra specialized at a root of unity admits a multiplicative splitting (non unital). We also find a basis of the toral part of the small quantum algebra consisting of pairwise orthogonal idempotents summing up to 1, and likewise in the modular case of the algebra of distributions for a semisimple algebraic group.

preprint2014arXivOpen access
Michel GrosMasaharu Kaneda
math.RTmath.QA
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Michel GrosMasaharu Kaneda

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