Re: choosing a branch cut

*To*: mathgroup at smc.vnet.net*Subject*: [mg6356] Re: choosing a branch cut*From*: me at bc.edu*Date*: Thu, 13 Mar 1997 01:20:11 -0500 (EST)*Organization*: Boston College*Sender*: owner-wri-mathgroup at wolfram.com

I think there is no simple solution, but it might help to use ArcTan[x,y]. Then you have only one branch cut along y=0 AND x<0. Look at Plot3D[ArcTan[x,y],{x,-2,2},{y,-2,2}]; versus Plot3D[ArcTan[y/x],{x,-2,2},{y,-2,2}]; The latter has a cut along x=0. Have fun with Multivalued functions!!