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In algebraic geometry, an Endrass surface is a nodal surface of degree 8 with 168 real nodes, found by Endrass (1997).[1] As of 2007, it remained the record-holder for the most number of real nodes for its degree;[2] however, the best proven upper bound, 174, does not match the lower bound given by this surface.[2][3]
See also

Barth surface
Sarti surface
Togliatti surface

References

Endrass, S. (1997), "A projective surface of degree eight with 168 nodes", Journal of Algebraic Geometry 6 (2): 325–334, arXiv:alg-geom/9507011, ISSN 1056-3911, MR 1489118
Breske, Sonja; Labs, Oliver; van Straten, Duco (2007). "Real line arrangements and surfaces with many real nodes". In Jüttler, Bert; Piene, Ragni. Geometric Modeling and Algebraic Geometry. Springer. pp. 47–54. arXiv:math/0507234. ISBN 9783540721857.
Miyaoka, Yoichi (1984). "The maximal number of quotient singularities on surfaces with given numerical invariants". Mathematische Annalen 268 (2): 159–171. doi:10.1007/BF01456083. MR 744605.

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