     }
 } ;
 
-HELP: derivative-func ( function -- der )
+HELP: derivative-func
 { $values { "func" "a differentiable function" } { "der" "the derivative" } }
 { $description
     "Provides the derivative of the function. The implementation simply "

    }
} ;

HELP: (derivative) ( x function h err -- m )
{ $values
    { "x" "a position on the function" }
    { "function" "a differentiable function" }
    {
        "h" "distance between the points of the first secant line used for "
        "approximation of the tangent. This distance will be divided "

USING: help.markup help.syntax math math.functions ;
IN: math.derivatives

HELP: derivative ( x function -- m )
{ $values { "x" "a position on the function" } { "function" "a differentiable function" } { "m" number } }
{ $description
    "Approximates the slope of the tangent line by using Ridders' "
    "method of computing derivatives, from the chapter \"Accurate computation "
