module Gsl_diff: sig .. end
sig
end
val central : Gsl_fun.gsl_fun -> float -> Gsl_fun.result
Gsl_fun.gsl_fun -> float -> Gsl_fun.result
val forward : Gsl_fun.gsl_fun -> float -> Gsl_fun.result
val backward : Gsl_fun.gsl_fun -> float -> Gsl_fun.result