LMFDB/lmfdb — pull request #169 by jwj61 (2014-05-01 20:19:55+00:00)
Title: Conductor bound for computing Dirichlet characters of an abelian field

If we try to use a Dirichlet character, the whole character group is computed. If the conductor is large, this will either take too long or crash. This avoids computing them for abelian number fields with large conductor and similarly for L-functions of those fields.