Cuspidal ℓ-modular representations of p-adic classical groups

For a classical group over a non-archimedean local field of odd residual characteristic , we construct all cuspidal representations over an arbitrary algebraically closed field of characteristic different from , as representations induced from a cuspidal type. We also give a fundamental step towards the classification of cuspidal representations, identifying when certain cuspidal types induce to equivalent representations; this result is new even in the case of complex representations. Finally, we prove that the representations induced from more general types are quasi-projective, a crucial tool for extending the results here to arbitrary irreducible representations.