For ℓ-divisible extensions K/F, the ℓ-rank of the class group of K is at least the number of base primes with at least one ℓ-divisible ramification index, divided by a group invariant, corrected by unit ranks and the ℓ-part of the degree.
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Lower bounds on the $\ell$-rank of ideal class groups
For ℓ-divisible extensions K/F, the ℓ-rank of the class group of K is at least the number of base primes with at least one ℓ-divisible ramification index, divided by a group invariant, corrected by unit ranks and the ℓ-part of the degree.