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On the image of the trivial source ring in the ring of virtual characters of a finite group
We examine the cokernel of the canonical homomorphism from the trivial source ring of a finite group to the ring of p-rational complex characters.We use Boltje and Coşkun's theory of fibered biset functors to determine the structure of the cokernel.An essential tool in the determination of this structure is Bouc's …