Function: ellglobalred
Section: elliptic_curves
C-Name: ellglobalred
Prototype: G
Help: ellglobalred(e): e being an elliptic curve, returns [N,[u,r,s,t],c],
 where N is the conductor of e, [u,r,s,t] leads to the standard model for e,
 and c is the product of the local Tamagawa numbers c_p
Description: 
 (gen):gen	ellglobalred($1)

