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If $\rho:\Gal(\overline\Q/\Q)\to\GL_n(\C)$ is an Artin representation, a prime $p$ is unramified if it is not ramified.

Equivalently, a prime is unramified if the inertia subgroup for a prime above $p$ is contained in the kernel of $\rho$.

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  • Review status: beta
  • Last edited by John Jones on 2016-06-06 19:19:03
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