The conjecture for sphere eversion
Let be the set of paths in joining the standard to the oppositely oriented sphere, and define
The conjecture. The number is attained by a path such that both restrictions and are Willmore flows, and is the inversion of the Morin surface, a minimal surface with four planar ends. The passage describes this as a step toward the conjecture and gives the lower bound , but does not establish the asserted attainment statement.
References
Primary source
Tian Lan, Dorian Martino and Tristan Rivière, “The Analysis of Willmore Surfaces and its Generalizations in Higher Dimensions”, arXiv:2511.01777 (2026).
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