On A characteristic of congruence subgroups of the group $G=SL(2,\mathbb{Z})$
Funkcionalʹnyj analiz i ego priloženiâ, Tome 4 (1970) no. 2, pp. 89-90
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@article{FAA_1970_4_2_a14,
author = {D. A. Kazhdan},
title = {On {A} characteristic of congruence subgroups of the group $G=SL(2,\mathbb{Z})$},
journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
pages = {89--90},
publisher = {mathdoc},
volume = {4},
number = {2},
year = {1970},
language = {ru},
url = {http://geodesic.mathdoc.fr/item/FAA_1970_4_2_a14/}
}
D. A. Kazhdan. On A characteristic of congruence subgroups of the group $G=SL(2,\mathbb{Z})$. Funkcionalʹnyj analiz i ego priloženiâ, Tome 4 (1970) no. 2, pp. 89-90. http://geodesic.mathdoc.fr/item/FAA_1970_4_2_a14/