Both have circular faces and the super simplex surface can be represented with a cone whilst the super cube surface has a thick superbolic gradient inner surface with the circular bottom in the center.
A convergent curve function when represented on a graph converges towards a certain curve form. An example of this may be x^2.
A divergent curve function would be like x^x where when graphed from 1 to ever bigger numbers you diverge off the graph.
You can transform a divergent curve with a second divergent curve. You can also make convergent curves more divergent or fully divergent also. The size of the numbers one would be supposidly working with is irrelevant as you are only working with convergent and divergent curve properties not actually using huge numbers just emulating if you could setting infinity 360° dials and curve or modular features.