Sahlar F. MeherremRefet Polat2025-10-0620111110-757X1687-004210.1155/2011/204613http://dx.doi.org/10.1155/2011/204613https://gcris.yasar.edu.tr/handle/123456789/5801Some properties of the weak subdifferential are considered in this paper. By using the definition and properties of the weak subdifferential which are described in the papers (Azimov and Gasimov 1999, Kasimbeyli and Mammadov 2009, Kasimbeyli and Inceoglu 2010) the author proves some theorems connecting weak subdifferential in nonsmooth and nonconvex analysis. It is also obtained necessary optimality condition by using the weak subdifferential in this paper.EnglishCALCULUSArticle