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Finite group such that $K_{-1} (\mathbb Z G)$ has non-trivial torsion
According to Carters Lower K-theory of finite groups for a finite group $G$ we have
$$ K_{-1} (\mathbb Z G) = \mathbb Z^r \oplus \mathbb Z_2^s $$
where $s$ is the sum over all irreducible ...
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