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Consider the Grothendieck group of finite type projective modularrepresentations of the symmetric groups on n letters, or more generally, of itswreath product with a finite group. They form a graded group, with a productdefined using induction. We show that the resulting graded ring is a polynomialring.

Polynomialit{\'e} d'anneaux de repr{\'e}sentations modulaires projectives