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Deformations of Galois representations associated to the cusp form $$\Delta$$. (English) Zbl 0723.11064
Sémin. Théor. Nombres, Paris/Fr. 1987-88, Prog. Math. 81, 51-62 (1990).
[For the entire collection see Zbl 0686.00006.]
The author studies versal deformations of the Galois representations associated to the weight 12 cusp form $$\Delta$$ as an example of the general theory of deformations of Galois representations attached to modular forms and elliptic curves. Many explicit examples are given.

##### MSC:
 11S20 Galois theory 11F80 Galois representations
##### Keywords:
Galois group; versal deformations; cusp form