Steinerian

In algebraic geometry, a Steinerian of a hypersurface, introduced by Steiner (1854), is the locus of the singular points of its polar quadrics.

References

• Coolidge, Julian Lowell (1959) [1931], A treatise on algebraic plane curves, New York: Dover Publications, ISBN 978-0-486-49576-7, MR 0120551 
• Dolgachev, Igor V. (2012), Classical Algebraic Geometry: a modern view, Cambridge University Press, ISBN 978-1-107-01765-8 
• Steiner, Jakob (1854), "Allgemeine Eigenschaften der algebraischen Curven.", Journal für Reine und Angewandte Mathematik (in German) 47: 1–6, doi:10.1515/crll.1854.47.1, ISSN 0075-4102