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On the set of points of zero torsion for negative-torsion maps of the annulus
For negative-torsion maps on the annulus we show that on every $ \mathscr{C}^1 $ essential curve there is at least one point of zero torsion. As an outcome we deduce that the Hausdorff dimension of the set of points of zero torsion is greater or equal 1. As a byproduct …