These two documents DO NOT reconciliate the Ridder derivative operator.
They reconciliate wrt the Smath derivative operator that does not parse
a constrained function. The proposal considers only the 1rst derivative.

Jean

Finite Differences DERIV Parametric.sm (9,5 KiB) scaricato 1559 volta(e). => read first

Finite Differences [Fnct, Deriv, Cumul].sm (65,31 KiB) scaricato 1379 volta(e). => read next