## Title data

Baier, Robert ; Farkhi, Elza:

**The Directed Subdifferential of DC functions.**

Hausdorff-Research-Institute

Bonn
,
2008
. - 19 p.

## Abstract in another language

Directed sets are a linear normed and partially ordered space in which the convex cone of all nonempty convex compact sets in |R is embedded. This space forms a Banach space and provides a visualization of differences of embedded convex compacts sets as usually non-convex sets in |R with attached normal directions. A. Rubinov suggested to define a subdifference for differences of convex functions via the difference of embedded convex subdifferentials. The directed subdifferential and its visualization, the Rubinov subdifferential, inherit interesting properties from the Banach space of directed sets, e.g. most of A. Ioffe's axioms for subdifferentials hold as well as the validness of the sum rule for differentials not as an inclusion, but in form of an equality. The relations to other known convex and non-convex subdifferentials are discussed as well as optimality conditions and the easy recovering of descent and ascent directions.

## Further data

Item Type: | Preprint, postprint |
---|---|

Additional notes: | Contents:
1. Introduction 1.1 Basic Notations 2. Preliminaries - Some Known Subdifferentials 3. Directed Sets 4. The Directed Subdifferential 5. Optimally Conditions, Descent and Ascent Directions 6. Conclusions |

Keywords: | Nonsmooth analysis; Subdifferential calculus; Difference of convex (DC) functions; Optimality conditions; Ascent and descent directions |

Subject classification: | Mathematics Subject Classification Code: 49J52 (90C26 90C46 49J50) |

Institutions of the University: | Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Mathematics Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Mathematics > Chair Mathematics V (Applied Mathematics) |

Result of work at the UBT: | Yes |

DDC Subjects: | 500 Science 500 Science > 510 Mathematics |

Date Deposited: | 04 Mar 2021 09:53 |

Last Modified: | 23 Mar 2021 13:22 |

URI: | https://eref.uni-bayreuth.de/id/eprint/63667 |