Vsevolod I. Ivanov stated (Nonlinear Analysis 125 (2015), 270-289) the general second-order optimality condition for the constrained vector problem in terms of Hadamard derivatives. We will consider its special case for a scalar problem and show some corollaries for example for ${\ell}$--stable at feasible point functions. Then we show the advantages of obtained results with respect to the previously obtained results.
${\ell }$-stable function, generalized second-order derivative, optimality conditions, $C^{1;1}$-function
49K10, 49J52