This is the historical basis for the interest that those functions which are invariant or at least show a clear behavior under the substitutions (0.1) have found since the beginning of the theory of elliptic functions.

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Geometry in the upper half-plane and the action of the modular group

  • Max Koecher,
  • Aloys Krieg

摘要

This is the historical basis for the interest that those functions which are invariant or at least show a clear behavior under the substitutions (0.1) have found since the beginning of the theory of elliptic functions.