Upper-bound conjecture for lines on Weddle surfaces

Let ZZ be a set of six points in linearly general position in P3\mathbb{P}^3, and let W(Z)\mathcal W(Z) denote its Weddle surface. Upper-bound conjecture for lines on Weddle surfaces. The surface W(Z)\mathcal W(Z) contains at most 3737 lines. This is motivated by the example in the paper producing 3737 lines and by comparison with known bounds for lines on smooth and nodal quartic surfaces; the supplied text does not establish the proposed upper bound.

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Primary source

Luca Chiantini, Łucja Farnik, Giuseppe Favacchio, Brian Harbourne, Juan Migliore, Tomasz Szemberg and Justyna Szpond, “Weddle schemes”, arXiv:2606.25060 (2026).

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