#### Vol. 276, No. 2, 2015

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On the density theorem for the subdifferential of convex functions on Hadamard spaces

### Mina Movahedi, Daryoush Behmardi and Seyedehsomayeh Hosseini

Vol. 276 (2015), No. 2, 437–447
##### Abstract

We introduce a dual space for any geodesically complete Hadamard space. By using this notion we give a new definition of the subdifferential of convex functions on geodesically complete Hadamard spaces. Some properties of this subdifferential, such as a density theorem, are proved.