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Two cases of Stark’s conjecture. (English) Zbl 0554.12006

Stark has conjectured the existence of an element in the number field \(K\) whose absolute values at infinite primes provide the evaluation of first derivatives at \(s=0\) of \(L\)-functions for an abelian extension \(K/k\). We first prove this conjecture with some basic class field theory for the case of a tame multiquadratic extension \(K/k\). Then, after Shintani, we consider the case when \(k\) is real quadratic and \(K\) is quadratic over an absolutely abelian field. Using Stark’s work, we improve Shintani’s result by proving the conjecture as stated above. That these two cases held promise was suggested in a paper of Tate.
Reviewer: Jonathan W. Sands

MSC:

11R42 Zeta functions and \(L\)-functions of number fields
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References:

[1] Sands, J.W.: Abelian fields and the Brumer-Stark conjecture. Compos. Math.53, 337-346 (1984) · Zbl 0552.12007
[2] Sands, J.W.: Galois groups of exponent two and the Brumer-Stark conjecture. J. Reine Angew. Math.349, 129-135 (1984) · Zbl 0521.12009 · doi:10.1515/crll.1984.349.129
[3] Shintani, T.: On certain ray class invariants of real quadratic fields. J. Math. Soc. Japan30, 139-167 (1978) · Zbl 0392.12009 · doi:10.2969/jmsj/03010139
[4] Stark, H.M.:L functions ats=1. IV. First derivatives ats=0. Adv. Math.36, 197-235 (1980) · Zbl 0475.12018 · doi:10.1016/0001-8708(80)90049-3
[5] Tate, J.: On Stark’s conjectures on the behavior ofL(s,?) ats=0. J. Fac. Sci. Univ. Tokyo Sect. IA28, 963-978 (1982) · Zbl 0514.12013
[6] Tate, J.: Les conjectures de Stark sur les fonctionsL d’Artin ens=0; notes d’un cours à Orsay rédigees par D. Bernardi et N. Schappache. Boston, Basel, Stuttgart: Birkhäuser 1984 · Zbl 0545.12009
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