Objective Function and Derivatives The input argument fun refers to an IML module that specifies a function that returns f, a vector of length m for least-squares subroutines or a scalar for other ...

Anthony P. Morse, Dini Derivatives of Continuous Functions, Proceedings of the American Mathematical Society, Vol. 5, No. 1 (Feb., 1954), pp. 126-130 ...

For example, studies addressing the pre-Schwarzian and Schwarzian derivatives have established new criteria that enhance our ability to characterise the geometric behaviour of harmonic mappings [1].

Arthur Schwartz, Derivative Functions in Syntax, Language, Vol. 44, No. 4 (Dec., 1968), pp. 747-783 ...