Modular Units pp 146-171 | Cite as

The Cuspidal Divisor Class Group on X1(N)

  • Daniel S. Kubert
  • Serge Lang
Part of the Grundlehren der mathematischen Wissenschaften book series (GL, volume 244)


In this chapter we assume that the reader is acquainted with the basic definitions concerning the modular curve X 1(N). We wish to analyze its cuspidal divisor class group. It turns out we find an analogous theory to the case of X(N), provided we restrict ourselves to part of this divisor class group, as described in §2 and §3.


Group Ring Class Number Projective Limit Bernoulli Number Quadratic Relation 
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Copyright information

© Springer Science+Business Media New York 1981

Authors and Affiliations

  • Daniel S. Kubert
  • Serge Lang

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