#ContourPlot of equal values of #BipolarCoordinates with #foci at (0,-1) and (0,1). Plotted using #wxmaxima. These #coordinates are #orthogonal #curvilinear.
https://en.wikipedia.org/wiki/Bipolar_coordinates
#ContourPlot of equal values of #BipolarCoordinates with #foci at (0,-1) and (0,1). Plotted using #wxmaxima. These #coordinates are #orthogonal #curvilinear.
https://en.wikipedia.org/wiki/Bipolar_coordinates