Stable Flags and the Riemann-Hilbert Problem

Details Stable Flags and the Riemann-Hilbert Problem Stable Flags and the Riemann-Hilbert Problem

2010-03-26

arxiv.org/abs/1003.5021v1

Mathematics

Classical Analysis and ODEs

39 pages

Scientific paper

We tackle the Riemann-Hilbert problem on the Riemann sphere as stalk-wise logarithmic modifications of the classical R\"ohrl-Deligne vector bundle. We show that the solutions of the Riemann-Hilbert problem are in bijection with some families of local filtrations which are stable under the prescribed monodromy maps. We introduce the notion of Birkhoff-Grothendieck trivialisation, and show that its computation corresponds to geodesic paths in some local affine Bruhat-Tits building. We use this to compute how the type of a bundle changes under stalk modifications, and give several corresponding algorithmic procedures.

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