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[Sidefx-houdini-list] First question to the list
This was fun, glad you brought it up.
To see (y4 - x4 + a y2 + b x2 = 0) drop in a geometry node, go in and delete the file node
and add an isosurface node. Enter $Y*$Y*$Y*$Y-$X*$X*$X*$X+sin($FF)*$Y*$Y+cos($FF)*$X*$X
into the implicit function parameter window and hit the play button.
best,
david