Abstract
We develop a method to compute the Hermite-Humbert constants γK,n of a real quadratic number field K, the analogue of the classical Hermite constant γn when Q is replaced by a quadratic extension. In the case n = 2, the problem is equivalent to the determination of lowest points of fundamental domains in H2 for the Hilbert modular group over K, that had been studied experimentally by H. Cohn. We establish the results he conjectured for the fields Q(√2), Q(√3) and Q(√5). The method relies on the characterization of extreme forms in terms of perfection and eutaxy given by the second author in an earl ier paper.
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