Computable fixed-point selection for nonexpansive mappings on two-dimensional Banach spaces
Computable fixed-point selection for nonexpansive mappings on two-dimensional Banach spaces
Let be a uniformly convex, smooth, computable Banach space of dimension two, and let be bounded, convex, and located, meaning that its distance function is computable. Write for the represented space of nonempty co-semi-decidable convex subsets of , and for the relevant space of nonexpansive self-mappings of . Computable fixed-point selection conjecture. The multi-valued mapping
is computable. This is presented as a possible generalisation of the preceding two-dimensional Hilbert-space result to uniformly convex and smooth real Banach spaces. The source gives no resolution evidence for this claim, so its status remains open.
Sources & referencesView supporting material
Primary source
Eike Neumann, “Computational Problems in Metric Fixed Point Theory and their Weihrauch Degrees”, arXiv:1506.05127 (2015).
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