MATEMATIČKI VESNIK
МАТЕМАТИЧКИ ВЕСНИК



MATEMATIČKI VESNIK
A note on modular curves and fundamental units of negative norm
Christian Weiß

Abstract

We re-prove the fact that the fundamental unit of the ring of integers of a real quadratic number field is of negative norm whenever the discriminant is a prime number congruent to $1 \mod 4$.

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Keywords: Hilbert modular surface, fundamental unit.

MSC: 11F41, 11R11

Pages:  315--316     

Volume  66 ,  Issue  3 ,  2014