Local inversion of planar maps with nice nondifferentiability structure

Details Local inversion of planar maps with nice nondifferentiability structure Local inversion of planar maps with nice nondifferentiability structure

2011-10-06

arxiv.org/abs/1110.1329v1

Mathematics

Classical Analysis and ODEs

14 pages

Scientific paper

When the plane is pie-sliced in $n\leq 4$ parts (with nonempty interior and common vertex at the origin) our main result provides a sufficient condition for any map $L$, that is continuous and piecewise linear relatively to this slicing, to be invertible. Some examples show that the assumptions of the theorem cannot be relaxed too much. In particular, convexity of the slices cannot be dropped altogether when $n=4$. This result cannot be plainly extended to a greater number of slices. Our result is proved by a combination of linear algebra and topological arguments.

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