Articles written in Proceedings – Mathematical Sciences
Volume 97 Issue 1-3 December 1987 pp 251-262
The Manin—Drinfeld theorem asserts the finiteness of the cuspidal divisor class group of a modular curve corresponding to a congruence subgroup. The purpose of the note is to draw attention to the connection between this theorem and Ramanujan sums, and to the question of what happens for non-congruence subgroups.
Volume 105 Issue 3 August 1995 pp 259-267
Volume 129 | Issue 5
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