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Monotone vector fields and generation of nonexpansive semigroups in complete CAT(0) spaces
- Publication Year :
- 2019
- Publisher :
- arXiv, 2019.
-
Abstract
- In this paper, we discuss about monotone vector fields, which is a typical extension to the theory of convex functions, by exploiting the tangent space structure. This new approach to monotonicity in CAT(0) spaces stands in opposed to the monotonicity defined earlier in CAT(0) spaces by Khatibzadeh and Ranjbar [14] and Chaipunya and Kumam [8]. In particular, this new concept extends the theory from both Hilbert spaces and Hadamard manifolds, while the known concept barely has any obvious relationship to the theory in Hadamard manifolds. We also study the corresponding resolvents and Yosida approximations of a given monotone vector field and derive many of their important properties. Finally, we prove a generation theorem by showing convergence of an exponential formula applied to resolvents of a monotone vector field. Our findings improve several known results in the literature including generation theorems of Jost [13, Theorem 1.3.13], Mayer [19, Theorem 1.13], Stojkovic [22, Theorem 2.18], and Bac\'ak [4, Theorem 1.5] for proper, convex, lower semicontinuous functions in the context of complete CAT(0) spaces, and also by Iwamiya and Okochi [11, Theorem 4.1] for monotone vector fields in the context of Hadamard manifolds.
- Subjects :
- TheoryofComputation_MISCELLANEOUS
90C33, 65K15, 49J40, 49M30, 47H05
Pure mathematics
Control and Optimization
Structure (category theory)
Monotonic function
Space (mathematics)
01 natural sciences
Mathematics - Metric Geometry
Tangent space
FOS: Mathematics
0101 mathematics
Mathematics - Optimization and Control
Mathematics
Resolvent
010102 general mathematics
Metric Geometry (math.MG)
Computer Science Applications
Functional Analysis (math.FA)
010101 applied mathematics
Mathematics - Functional Analysis
Monotone polygon
Optimization and Control (math.OC)
Signal Processing
Vector field
Convex function
Analysis
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....77d98070048ba02a2c644e99081382ef
- Full Text :
- https://doi.org/10.48550/arxiv.1906.05984