Steffensen Generalized 3, lets you change the function to .
Steffensen Polynomial, lets you insert your own polynomial input as p(z)
(coefficients in degree descending order).
Steffensen Formula, lets you set a custom function.
While using the Steffensen functions, Bailout Conditions, Bailout, Periodicity Checking,
most of the out coloring algotithms, Perturbation, Initial Value, Julia, and Julia Map options will be disabled.
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