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After understanding algorithms for computing modular forms, one can focus 
on arithmetic information associated to them, particularly to the weight 2 
cusp forms for 
 .  These correspond to isogeny classes of abelian 
varieties over
.  These correspond to isogeny classes of abelian 
varieties over 
 which are factors of the Jacobian
 which are factors of the Jacobian  .  
In weight 2 one can look at the invariants of a particular representative 
modular abelian variety, rather than the more abstract notion of a Galois 
representation.
.  
In weight 2 one can look at the invariants of a particular representative 
modular abelian variety, rather than the more abstract notion of a Galois 
representation.    
The goal of this project is to develop algorithms and implementations to investigate as many as possible of the following invariants for general modular abelian varieties.
Half of this chapter was written by David Kohel.
