Generic projection invariance of Euclidean distance degree for arbitrary varieties
Let be an affine variety, let be a generic linear subspace with , where , and let , with the orthogonal projection. Generic projection invariance conjecture. Fact~ holds for arbitrary varieties; equivalently, the generic Euclidean distance degrees satisfy
The stated fact is known when is an affine cone over a projective variety, but the authors are not aware of a proof for arbitrary varieties; establishing this would contribute fundamentally to the theory of Euclidean distance degrees.
References
Primary source
Giovanni Luca Marchetti, Erin Connelly, Paul Breiding and Kathlén Kohn, “Critical Points of Degenerate Metrics on Algebraic Varieties: A Tale of Overparametrization”, arXiv:2512.21029 (2025).
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