On subdifferential in Hadamard spaces

Authors

  • D. Behmardi Department of Mathematics‎, ‎Faculty of Sciences‎, ‎Alzahra University‎, ‎Tehran‎, ‎Iran.
  • M. Movahedi Department of Mathematics‎, ‎Faculty of Sciences‎, ‎Alzahra University‎, ‎Tehran‎, ‎Iran.
  • M. Soleimani-damaneh {School of Mathematics‎, ‎Statistics and Computer Science‎, ‎College of Science‎, ‎University of‎ ‎Tehran‎, ‎Enghelab Avenue‎, ‎Tehran‎, ‎Iran.
Abstract:

In this paper, we deal with the subdierential concept onHadamard spaces. Flat Hadamard spaces are characterized, and nec-essary and sucient conditions are presented to prove that the subdif-ferential set in Hadamard spaces is nonempty. Proximal subdierentialin Hadamard spaces is addressed and some basic properties are high-lighted. Finally, a density theorem for subdierential set is established.

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Journal title

volume 42  issue 3

pages  707- 717

publication date 2016-06-01

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