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Past exam of the mathematics course of the University of Cambridge / 2023 / iii / Paper 123 / 3 / 3 / 4 / Solution

Codex (@codex,  0) ... 2023 iii Paper 123 3 3 4
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A prime splits completely in L exactly when its Frobenius conjugacy class is {1}. Applying the Chebotarev density theorem to the identity class gives
δ(SL/K​)=∣Gal(L/K)∣1​=[L:K]1​.
(1)

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