FUNCTION :  eta[etaWe] - Computes the image of an eta function eta(t tau)
                         under the action of Atkin-Lehner involution W[ee]
                         of GAMMA[0](N)

                

CALLING SEQUENCE :  etaWe(t,W,ee,N)
                    

PARAMETERS :      -  
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GLOBAL VARIABLES : 

SYNOPSIS :   
   

EXAMPLES :   

DISCUSSION :

SEE ALSO :