Harmonic sum and duality.
Elements of quasiconvex subdifferential calculus.
On the use of semi-closed sets and functions in convex analysis
The main aim of this short note is to show that the subdifferentiability and duality results established by Laghdir (2005), Laghdir and Benabbou (2007), and Alimohammady et al. (2011), stated in Fréchet spaces, are consequences of the corresponding known results using Moreau-Rockafellar type conditions.
On a class of convex sets
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