On the Plus Parts of the Class Numbers of Cyclotomic Fields

Citation:

Kalyan CHAKRABORTY,Azizul HOQUE.On the Plus Parts of the Class Numbers of Cyclotomic Fields[J].Chinese Annals of Mathematics B,2025,46(2):261~270
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Authors:

Kalyan CHAKRABORTY; Azizul HOQUE

Foundation:

the SERB MATRICS Grant (No. MTR/2021/00762) and the ANRF(SERB) Govt. of India Grant (No. CRG/2023/007323).
Abstract: The authors exhibit some new families of cyclotomic fields which have nontrivial plus parts of their class numbers. They also prove the 3-divisibility of the plus part of the class number of another family consisting of infinitely many cyclotomic fields. At the end, they provide some numerical examples supporting our results.

Keywords:

Class numbers  Maximal real subfield of cyclotomic fields  Real quadratic fields

Classification:

11R29, 11R18, 11R80
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