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AlffEllipticFunField
Creates an elliptic algebraic function field F/k.
Syntax:
F := AlffEllipticFunField(k, L);
| algebraic function field | 
  F    | 
 | 
| field | 
  k    | 
 | 
| list | 
  L    | 
 | 
Description:
Let k be a field. The function creates the algebraic elliptic
function field F.
The field is defined by the polynomial
y^2 + a_1Ty + a_3y-( T^3 + a_2T^2 + a_4T + a_6) with a_i \in k.
In characteristic 2,3 the user should be carefull
Example:
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