Abstract
We introduce and study the notion of the \(\left( \sigma ,y\right) \)-conjugate of a proper \(\sigma \)-convex function. Some relations between the \(\sigma \)-subdifferentials and the Clarke–Rockafellar subdifferential are established. Also, we present some results regarding the \(\sigma \)-monotonicity of the \(\sigma \)-subdifferential of a function and its \(\sigma \)-convexity. Moreover, we obtain some particular relationships between the \(\sigma \)-subdifferential and the \(\left( \sigma ,y\right) \)-conjugate.
Similar content being viewed by others
References
Alizadeh, M. H.: Fitzpatrick function for generalized monotone operators, J. Nonlinear Convex Anal. (to appear). (arXiv:1801.04519v1)
Alizadeh, M.H.: On generalized convex functions and generalized subdifferential. Optim. Lett. 14, 157–169 (2020)
Alizadeh, M.H., Roohi, M.: Some results on pre-monotone operators. Bull. Iran. Math. Soc. 43, 2085–2097 (2017)
Alizadeh, M.H., Hadjisavvas, N., Roohi, M.: Local boundedness properties for generalized monotone operators. J. Convex Anal. 19, 49–61 (2012)
Aussel, D., Corvellec, J.N., Lassonde, M.: Mean value property and subdifferential criteria for lower semicontinuous functions. Trans. Am. Math. Soc. 347, 4147–4161 (1995)
Bauschke, H.H., Combettes, P.L.: Convex Analysis and Monotone Operator Theory in Hilbert Spaces, 2nd edn. Springer, Cham (2017)
Borwein, J.M.: Fifty years of maximal monotonicity. Optim. Lett. 4, 473–490 (2010)
Clarke, F.H.: Optimization and Nonsmooth Analysis. Wiley, New York (1983)
Correa, R., Jofré, A., Thibault, L.: Subdifferential monotonicity as characterization of convex functions. Numer. Funct. Anal. Optim. 15, 531–535 (1994)
Correa, R., Jofré, A., Thibault, L.: Subdifferential characterization of convexity. In: Du, D.-Z., Qi, L., Wormersley, R.S. (eds.) Recent Advances in Nonsmooth Optimization, pp. 18–23. World Scientific Publ, River Edge (1995)
Hiriart-Urruty, J.B., Lemarechal, C.: Fundamentals of Convex Analysis. Springer, Berlin (2001)
Huang, H., Sun, C.: Sigma-subdifferential and its application to minimization problem. Positivity 24, 539–551 (2020)
Iusem, A.N., Kassay, G., Sosa, W.: An existence result for equilibrium problems with some surjectivity consequences. J. Convex Anal. 16, 807–826 (2009)
Jofré, A., Luc, D.T., Théra, M.: \(\epsilon \)-subdifferential and \(\epsilon \)-monotonicity. Nonlinear Anal. 33, 7190 (1998)
Jourani, A.: Subdifferentiability and subdifferential monotonicity of \(\gamma \)-paraconvex functions. Control Cyber 25, 721–737 (1996)
Luc, D.T., Ngai, H.V., Théra, M.: On \(\epsilon \)-monotonicity and \(\epsilon \)-convexity. In: Ioffe, A., et al. (eds.) Calculus of Variations and Differential Equations (Haifa, 1998), Res. Notes Math. Ser. 410, pp. 82–100. Chapman & Hall, Boca Raton (1999)
Luc, D.T., Ngai, H.V., Théra, M.: Approximate convex functions. J. Nonlinear Convex Anal. 1(2), 155–176 (2000)
Zagrodny, D.: Approximate mean value theorem for upper subderivatives. Nonlinear Anal. T.M.A. 12, 1413–1428 (1988)
Zălinescu, C.: Convex Analysis in General Vector Spaces. World Scientific, Singapore (2002)
Acknowledgements
The author expresses his gratitude to Professor Nicolas Hadjisavvas for his many insightful comments, suggestions, discussions, and remarks, as well as Professor Oleg A. Prokopyev, Editor in chief of Optimization Letters. Also, I would like to thank the two referees for their valuable comments on the manuscript and their suggestions and corrections for improving the document. The research was in part supported by a grant from the Iran National Science Foundation (INSF) (No. 97024302).
Author information
Authors and Affiliations
Corresponding author
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Alizadeh, M.H. On generalized convex functions and generalized subdifferential II. Optim Lett 15, 2225–2240 (2021). https://doi.org/10.1007/s11590-020-01682-0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11590-020-01682-0