کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4595163 | 1335801 | 2008 | 12 صفحه PDF | دانلود رایگان |

An analogue over imaginary quadratic fields of a result in algebraic number theory known as Ihara's lemma is established. More precisely, we show that for a prime ideal p of the ring of integers of an imaginary quadratic field F, the kernel of the sum of the two standard p-degeneracy maps between the cuspidal sheaf cohomology is Eisenstein. Here Y0 and Y1 are analogues over F of the modular curves Y0(N) and Y0(Np), respectively. To prove our theorem we use the method of modular symbols and the congruence subgroup property for the group SL2(Z[1/p]) which is due to Mennicke [J. Mennicke, On Ihara's modular group, Invent. Math. 4 (1967) 202–228] and Serre [J.-P. Serre, Le problème des groupes de congruence pour SL2, Ann. of Math. (2) 92 (1970) 489–527].
Journal: Journal of Number Theory - Volume 128, Issue 8, August 2008, Pages 2251-2262