Polynomialit{é} d'anneaux de repr{é}sentations modulaires projectives
英文摘要：
Consider the Grothendieck group of finite type projective modular representations of the symmetric groups on n letters, or more generally, of its wreath product with a finite group. They form a graded group, with a product defined using induction. We show that the resulting graded ring is a polynomial ring.
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