FUNCTION :  ejac  -  used in jac2eprod 

CALLING SEQUENCE :  ejac(a,b,c)                                             
                    

PARAMETERS :      a - nonnegative integer
                  b - positive integer
                  c = infinity 

SYNOPSIS :  ejac(a,b,c) converts JAC(a,b,inifinity) in terms of
            EETA and GETA.


EXAMPLES :   

> with(thetaids):
> J:=JAC(1,5,infinity)/JAC(0,5,infinity);
                                JAC(1, 5, infinity)
                           J := -------------------
                                JAC(0, 5, infinity)

> jac2eprod(J);
                                  GETA(5, 1)
                                  ----------
                                     1/60
                                    q

> ejac(1,5,infinity)/ejac(0,5,infinity);
                                  GETA(5, 1)
                                  ----------
                                     1/60
                                    q

> egeta(5,1);
                                eta[5, 1](tau)
                                --------------
                                     1/60
                                    q

SEE ALSO :  


egeta,
 jac2eprod,
 jac2getaprod