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All lines on a smooth cubic surface in terms of three skew lines

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arxiv 2002.10367 v4 pith:XPYBPZTI submitted 2020-02-24 math.AG

classification math.AG
keywords linescubicsmoothsurfaceformulasskewcontainingincidence
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Jordan showed that the incidence variety of a smooth cubic surface containing 27 lines has solvable Galois group over the incidence variety of a smooth cubic surface containing 3 skew lines. As noted by Harris, it follows that for any smooth cubic surface, there exist formulas for all 27 lines in terms of any 3 skew lines. In response to a question of Farb, we compute these formulas explicitly. We also discuss how these formulas relate to Schl\"afli's count of lines on real smooth cubic surfaces.

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