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Concerning the second question, yes, it is reproducible. It seems that SageCell only plots one or two implicit_plot3d. I've been experimenting with this code:
var("x,y,z")
fig = implicit_plot3d(x^2+y+z==0, (x,-1,1), (y,-1,1), (z,-1,1), color="red")
#fig += implicit_plot3d(x-y+z^2==0, (x,-1,1), (y,-1,1), (z,-1,1), color="green")
#fig += implicit_plot3d(x-y^2+z^2==0, (x,-1,1), (y,-1,1), (z,-1,1), color="blue")
show(fig)
print("Finished")
Sometimes I could only plot one surface, sometimes two, but never the three surfaces.
