FUNCTION :  _ETAnm - a symbolic form of generalized eta-function eta[n,m](tau)
                     in terms of JAC

CALLING SEQUENCE :  _ETAnm(n,m)                                                
                    

PARAMETERS :      n,m  - positive integers

SYNOPSIS :  _ETAn(n) returns 
            JAC(m,n,infinity)*q^(1/2*QP2(m/n)*n)/JAC(0,n,infinity)
            which is a  symbolic form for eta[n,m](tau)

EXAMPLES :   


> with(thetaids):
> _ETAnm(5,1);
                                                1/60
                           JAC(1, 5, infinity) q
                           -------------------------
                              JAC(0, 5, infinity)



DISCUSSION :

eta[5,1](tau) = q^(1/60)*JAC(1,5)/JAC(0,5)


SEE ALSO :  

_ETAn,
_etan,
_etanm