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arXiv · 2611.06086

Iterated minimal Darboux transformations

Sakuma Takeshita·Masashi Yasumoto
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Abstract

In this paper, we investigate the superposition of two minimal Darboux transformations in Euclidean three-space. A four-dimensional permutability diagram for transformations of isothermic surfaces yields the common minimal transform for distinct nonzero parameters and an explicit formula for its Gauss map. This formula determines the planar ends over regular umbilic-free points of the seed: an end is embedded when the two transformed Gauss maps coincide away from the seed value and has multiplicity 3 when all three values coincide. We illustrate this criterion with the Enneper surface and the catenoid. For the catenoid, suitable parameters give complete surfaces of finite total curvature, and we determine the numbers and multiplicities of their planar ends from the parameters and initial values. In the family with multiplicity-3 ends, the remaining initial-value parameter realizes, up to rotation, the López--Ros deformation.

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Sakuma Takeshita, Masashi Yasumoto. 2026-11-04. Iterated minimal Darboux transformations. https://arxiv.org/abs/2611.06086

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