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On the class number formula of certain real quadratic fields

Abstract : In this note we give an alternate expression of class number formula for real quadratic fields with discriminant $d \equiv 5\, {\rm mod}\, 8$. %Dirichlet's classical class number formula for real quadratic fields expresses `class number' in somewhat `transcend' manner, which was simplified by P. Chowla in the special case when the discriminant $d = p \equiv 5\,{\rm mod}\, 8$ is a prime. We use another form of class number formula and transform it using Dirichlet's $1/4$-th character sums. Our result elucidates other generalizations of the class number formula by Mitsuhiro, Nakahara and Uhera for general real quadratic fields.
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K Chakraborty, S Kanemitsu, T Kuzumaki. On the class number formula of certain real quadratic fields. Hardy-Ramanujan Journal, Hardy-Ramanujan Society, 2013, 36, pp.1 - 7. ⟨hal-01112681⟩

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