Abstract

Let q be a power of an odd prime number p and K : = F q ( T ) be the rational function field with a fixed indeterminate T. For P a prime of K, let K P + be the maximal real subfield of the Pth-cyclotomic function field and O K P + its ring of integers. We prove that there exists infinitely many primes P of even degree such that the cardinal of the ideal class group Cl ( O K P + ) is divisible by q. We prove also an analogous result for imaginary extensions.

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