English

Realizing a Fake Projective Plane as a Degree 25 Surface in $\mathbb P^5$

Algebraic Geometry 2023-03-20 v3

Abstract

Fake projective planes are smooth complex surfaces of general type with Betti numbers equal to that of the usual projective plane. Recent explicit constructions of fake projective planes embed them via their bicanonical embedding in P9\mathbb P^9. In this paper, we study Keum's fake projective plane (a=7,p=2,{7},D327)(a=7, p=2, \{7\}, D_3 2_7) and use the equations of \cite{Borisov} to construct an embedding of fake projective plane in P5\mathbb P^5. We also simplify the 84 cubic equations defining the fake projective plane in P9\mathbb P^9.

Keywords

Cite

@article{arxiv.2301.09155,
  title  = {Realizing a Fake Projective Plane as a Degree 25 Surface in $\mathbb P^5$},
  author = {Lev Borisov and Zachary Lihn},
  journal= {arXiv preprint arXiv:2301.09155},
  year   = {2023}
}

Comments

11 pages, 1 table. Mathematica, Magma, and Macaulay2 code and key equations from the paper are included in separate files for convenience

R2 v1 2026-06-28T08:17:21.723Z