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symmetry sets

Proceedings of the Edinburgh Mathematical Society (1)

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Minkowski Symmetry Sets of Plane Curves
Part of
Graham Mark Reeve, Farid Tari
Journal:

Proceedings of the Edinburgh Mathematical Society / Volume 60 / Issue 2 / May 2017

Published online by Cambridge University Press:

19 May 2016, pp. 461-480
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We study the Minkowski symmetry set of a closed smooth curve γ in the Minkowski plane. We answer the following question, which is analogous to one concerning curves in the Euclidean plane that was treated by Giblin and O’Shea (1990): given a point p on γ, does there exist a bi-tangent pseudo-circle that is tangent to γ both at p and at some other point q on γ? The answer is yes, but as pseudo-circles with non-zero radii have two branches (connected components) it is possible to refine the above question to the following one: given a point p on γ, does there exist a branch of a pseudo-circle that is tangent to γ both at p and at some other point q on γ? This question is motivated by the earlier quest of Reeve and Tari (2014) to define the Minkowski Blum medial axis, a counterpart of the Blum medial axis of curves in the Euclidean plane.