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In page Ribet's theorem:

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However, for p large enough compared to the level N of the level-lowered newform, a rational newform (e.g. an elliptic curve) must level-lower to another rational newform (e.g. elliptic curve). In particular for pNN1+ε, the mod p Galois representation of a rational newform cannot be isomorphic to that of an irrational newform of level N.[1]