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Cotangent functors of curve singularities

✍ Scribed by Jürgen Herzog; Rolf Waldi


Publisher
Springer
Year
1986
Tongue
English
Weight
976 KB
Volume
55
Category
Article
ISSN
0025-2611

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Let X (l) be the modular curve, parameterizing cyclic isogenies of degree l, and Z (l) be its plane model, given by the classical modular equation l (X, >)"0. We prove that all singularities of Z (l), except two cusps, are intersections of smooth branches, and evaluate the order of contact of these